If you're talking about the big 1/35 (or is it 1/32), it was designed for RC and is a very easy conversion. Much better starting point than the Blue Devil Destroyer. It's not very detailed though, so be prepared for a lot of extra work if you want it to look it's best.
To make it RC does take some effort. The kit provided shafts, props, rudder, etc are totally worthless. I know Dumas has a couple of PT boats and one is 1/32... so the Dumas fittings may work. Midwest offers RC boat fittings as well.
The kit itself is poor and toylike. It also does not represent the PT-109 but rather just a generic Elco boat of that class. The real 109 had the forward life boat moved and a 37mm anti tank cannon fitted in its place, details not provided in the kit. The real boats also had a cambered deck, while the kit deck is a big flat die cut hunk of sheet styrene. Things like guns, the bridge, radar, lights, are blobby and toylike. For an R/C model its okay... you cant see a lot of detail 200 feet away in the middle of a pond. On the shelf its pretty sparse.
I believe people have also converted the newer and much nicer 1/35 Italeri kit to RC.