Designed and built my own homegym, including weights, J-hooks, safety's and dippingbar. 

Finished product. Designed and build/welded/clear coated by myself.
Totals around 153 cm deep (little over 5 feet)
Plate storage part is 60 cm deep (little less than 2 feet)
Workout area is 90 cm between uprights (little less than 3 feet)
225 cm high (7'4)
105 cm between uprights (3'5)
Made most of it bolt together, so I rearrange and upgrade later on.

I'm a professional metalworker, so the building of it wasn't very hard. Modeling all the parts in SolidWorks as a modeling rookie did take some time and effort though. Decided to make up my own logo (sitting bear) as to give it a personal touch.

Went for 70x70x3mm square tubing. 5 mm connecting flanges and feet. 20,5 mm holes, spaced 50 mm c.t.c. Made two set of J-hooks the blue sets distance between the mounting peg and where the bar rests is 25 mm greater than the red set. Giving the option to adjust in 25 mm increments. Mounting hardware is M20.

Laser cut most of the parts myself. J-hooks are made out of 5 mm plate with 10 mm Polyethylene lining. Bend the hooks myself, TIG welded on the supports to sandwich two 12,5 mm Polyethylene hooks.

Made out of two plate parts. Cut slots in the part that folds around the upright. Designed corresponding protrusions on the part with the bear cutout, so I could plug weld the backside. Cut out a hole for the 20 mm steel rod so I could weld that on both sides also.

Outsourced the tube laser work as we don't have a tube laser at work. Laser cut all the other flat material myself. The numbers in the uprights were a bit of a nightmare to model. After a quote from the tube laser people, I decided to reduce the amount of number cutouts in the front uprights. The middle uprights have a number each hole the front only has one every other hole.

5 mm braces and a 5 mm backplate, cut and bend to perfectly fit between the uprights. Got an ATX Rambar as a gift from my girlfriend. Great bar good grip, but the sleeve have ridges that make more noise than I would like when sliding on the plates. Might turn them down 0,5 mm in the lathe sometime.

Laser cut my own plates. Decided to make a 5KG logo plates. Put he off center so he sits nicely. The slight off balance in the plates is no problem for me. I primarily train the power lifts so no rapid movements where such a small off balance maters. Maybe went a little overboard with the logo's.

Bend me up a tube to make a dipping bar. I'm not that wide, so I made the tube come out way narrower than the commercially available dipping bars. Much more comfortable for me this way.

Drilled out the square tubing. Cut a few relieves in the inside of the square tubing and the beat the flaps around the round tubing, as to optimize the weld length. TIG welded the whole thing together. Solid as can be.

Rotate 45 degrees and slide in and out. there is a 20 mm pin slightly of center (so it will hang straight on its on) around the 24th hole. Lined al the parts that come in contact with the upright with some 4 mm rubber.

Hand stitched safety straps. Strap is some sort of seatbelt material and could hold up to 2500KG. 8 mm strip with a slight bends in it so goes from the 70 mm tubing to the 48mm strap. Made some 20 mm pins and plug welded on a logo cutout.

In the loop of the strap is a 50 mm piece of round tubing. For the bolt to clamp onto. When tightened the ears that go around the square tubing will sit just a little wider than the tube, so it's easy to adjust.

Load tested my hand stitching skills, stack weights 550KG did some jiggling with it. No problem.

750 KG started hearing some slight popping sounds. Called it good enough. On the stack you can see the other stitching design I tried. Looked worse and was a little weaker, so I went with the square with dash design.

Laser cut my own plate parts. Made 4 x 1,25KG plates. 2 x 5KG, 2X 10KG and 6 x 20KG plates. I don't deadlift heavy at home and suck at squatting. But I might have to upgrade soon

With the help of some software, I got pretty close to the goal weight. 15 mm plate.

After hear the noise the plates made when sliding on the barbell, I decide to incorporate a sliding bushing. Milled out the holes slightly with a boring head to accommodate the bushing. 0.12% of, still not bad though.

10mm plate. TIG welded on 8 mm handles and the 5 mm weight numbers. Decided to let the bushing stick out a little (less than aforementioned 8 mm) to help with the stability when hanging. It also serves as a standoff when loading plates in front of it. 1% off could be better.

15mm 20KG plates.

Made 8 bolt on weight pegs.

Shot of the backside of the backplate. All holes lined up perfectly. Backplate is secured with 8 x M20 bolts.

Might do some sort of lighting behind the backplate?

Made my own bench. Competition spec. 60 mm thick firm foam.

Upholstered the seat myself with some textured vinyl I think. Came out ok.

Some wheels and a third foot so you can stand it up and store.

Used the same 4 mm rubber as I did for the dip bar. Works great.

Polished logo cutout. Brazed on laser cut handle. The whole thing took about half a year. Mostly due to the designing aspect. The tube laser work was about €1400 and all the other stuff (plates, bench and accessories) ran me about €650. Next up, is some sort of cable attachment I think.