Well I agree that a taller transom would be better!!
But if you no what you are doing, and you don't mind a little water then the 20 will work!!
Offer the guy $5000 see what he says??
All boats are a work in progress IMO I have owned my boat 6 years now and I haven't stoped working on it yet!!
I added a 25 gal gas tank were the I/O use to be so now I have 3 tanks totaling 65 gal.
I have removed the air vents on the rear top of transom and made one a gas filler for the new tank and then I did the same with the middle one so I can fill the remote oil tank from out side the boat!!
If this doesn't work out then try to look for a I/O that needs to be repowered, Then convert!! I have made my boat to take a 25" shaft motor, and don't care about water comming over the transom! *;D
Its not as hard as you think to do this! I did it my self, and after 2 heavy use seasons it is as strong as ever!!
