Most everything here I purchased from Home Depot, with a few items bought at Princess Auto(Harbor Freight in the US. You may need to order some parts off Amazon)


Galvanized pipe: this pipe comes in common section lengths and are threaded to be able to screw together using pipe fittings, no welding needed. These components are easily found at most big box home improvement stores like Home Depot, Lowes, etc.

4x 18" 3/4 galvanized pipe
3x 12" 3/4 galvanized pipe
4x 2" 3/4" galvanized pipe
2x 6" 3/4" galvanized pipe
2x 3/4" end caps
6x 3/4" T-connectors
4x 3/4" 90 deg elbows
2x 3/4" couplings (straight connectors)
NOTE: replace the horizontal the 12" pipe with something longer IF your motor's overall width will not fit

red Loctite threadlocker

4x 1/2"x3/4"x1" brass flange bearings

about 36" piece of 1/2" threaded rod cut to 2 pieces using a dremel, long enough to fit all the wheels, washers and nuts
8x 1/2" nuts to fit the rod
8-10x fender washers (ID fits the rod, but also large enough outside diam to butt against T-connectors)

3/4" plywood
4x 1" u-bolts + hardware

2x ~7-8" wheels to fit 1/2" axles
2x ~6" wheels to fit 1/2" axle

strap secure lower leg to trolley

ASSEMBLY:
I'm assuming assembly is straight forward purely by looking at my build.. just screw all the pipe pieces together with the help of fittings. What may not be obvious is how I assembled the lower threaded axle. I basically ran the pre measured piece of threaded rod through the entire horizontal lower section of the trolley followed with the brass bearings slipped on and fitted into the T-connectors, followed by a washer, the wheel, another washer, then nuts, repeated on other side. For top axle its similar but you need to put the inside nuts and washers on before the wheels and outside washers/nuts.