The first HUGE barrier you have without a donor - no wiring harness and good luck locating one which makes your project DOA
Secondly there are a few parts that appear to be out of stock every where - so you'd be up the creek there too
Trying to find a fairly clapped out TAF isn't tough, but finding one that isn't over priced for what it is .... is.
Generally all after market play fields suck to a certain degree. No dimples, mis-dimpled, off set holes drilled or no holes drilled. clear coat mediocre if not suckville.
Donor machine will likely need every single moving piece, coil sleeves, coil stops etc replaced/rebuilt.
You can have a factory spec'd cab made - have it painted black then you can add a set of Rad Cals
ROUGH estimate:
Based off a $5K TAF, ordering a new cabinet, new playfield clear coated, all parts rebuilt you're looking ~$10k if you do the playfield swap yourself. Add a couple grand if you pay someone else.
Pro's - everything is brand new and "should" hold it's restored value for several years to come (Unless CGC does a remake)
Cons - now you're in the TAFG price range or you could spend about $2K less to buy a super nice one that's ready to play.