ive got a form 1 built on an early SDTA solvent trap components.
if i could go back and do it again - well i probably will build another in the future, but i digress - i'd probably go with one of the diversified machine components. their machining looks a bit nicer, although SDTA has gotten cleaner over time and offers better stuff these days.
i was able to complete mine with a basic home grade drill press. nothing fancy.
as for blowing it off the end of your gun... you have to maintain concentricity or that will happen. thats not likely the fault of the kit - thats mostly a fail by the end user. theres plenty of tools out there to help you make that happen without having to take out a second mortgage.
and you can just as easily blow a commercial can off the end of your barrel from a half of dozen issues just like you could with a form 1.
dont hesitate to give it a go!