It all depends on how much this kit costs.
I firmly believe in what you pay is what you get when it comes to things of this nature.
I pretty much bought everything from James for my conversion.
Aside from using some 1/8" to 3 1/6" pieces of steel and mig welding with a final powder coat (maybe they even used a can of spray paint), I think anyone that has minor fabrication skills could make the tranny mount for 15.00 worth of metal. All you need is a band saw, drill and have someone weld it together. Again, you just need the time and a little know how.
Once I drop in my motor, maybe I'll make a few extra of my custom mount.
H