Geez, there are so many parts on a SOHC4 that you can chrome when you think about it, (cam covers, alternator covers, clutch covers,sprocket covers etc) then of course the rest of the bike, like fuel tanks, oil tanks, swing-arms, shock bodies, fork lowers, triple trees, frames, engine mounts, axles battery box, not to mention fenders, levers, gauge bodies etc.
I really don't think a chrome engine exchange is viable though, most of the above parts and labour estimates are about half what a shop will really want, using premium priced genuine parts, and not just Ebay bargain prices, and add the cost of the chrome, and we're really getting into Harley territory.
Why not just start with "El Cheapo's Home of Krome" exchange service Tom, and leave that expensive and time consuming (read: low profit margin) mechanical work for some other pigeon? Just my humble opinion, as always.............