I'd buy both, if you dont want them you can sell them in parts they are worth more in parts.... they sell 50-200 depending on shape as a whole
just the seat alone in good condition is 89$.
The OOC Chopper is quite easy for both 4-stroke and 2-stroke.
for the 4-stroke you just need to drill some extra holes for 2x 2 1/2" flat u bolts
for the 2-stroke depending on rear size motor mount the mounts will cost from 50-90, and these mounts make it as easy as normal bikes
if you want Ape Hangers you can go through the whole fork change or do what i did use a Christmas tree bit/step up bit to make the handle posts wider but still be able to hold it down
there is also seat posts that lean back to help accommodate bigger riders from 5 ish - 6 ish foot
the only down side is you need to brace the back end, there is a horseshoe mount that does this that you can buy also.
all and all the OCC is a easy bike to do but not a cheap one.