I just picked up an '84 series 3 109 MoD FFR with stock soft top. As part of the deal, a full santana defender hard top was included. I'm looking to retrofit the top to the series 3, is there any difference I'd have to account for other than the windshield frame? I'm thinking I can make a filler panel to make up the gap there. It's also a 5 door top, but has the rear sliding windows, which I like, and most of the 3 door sides I've seen don't have the sliding windows. My thought is to make a filler panel for the top of the windshield and then put some locking cabinets in where the rear doors would be.

I'm in the US so 109 parts are not easy to come by and if you can find them, shipping is usually prohibitive on something as large as a roof.

Has anyone done this before?