Upload & Sell: Off
Honestly, I admire anybody looking at doing this themselves! I build and re-build many things and have never really thought about doing a shutter, but crap, I send about 4 bodies in a year to CPS for $350 each on top of the $500 membership!
Maybe I should look at getting a $100 pack of tools and lighted magnifying stand!
Why should we doubt somebody's ability to tackles something like this. It may be right up the OP's line of capability, even though to the rest of us seems daunting.