Installing a Stainless Marine outboard bracket

I have just purchased a Stainless Marine outboard bracket for my 34' Silverton that I'm converting from inboards to outboards. I bought the bracket at a marine flea market. It was made for a flat transom, my transom has a curve. I'll have to shim it - I've got a gap of about 4 inches at the outer ends of the bracket. The bracket will hold 4 outboards, made of welded aluminum - it is 90" wide with a swim platform built in, a 50" wide flotation chamber below the platform. I'll be spacing two motors 72" on center apart.

To shim the bracket, my first thought is to mix up some resin with fill and putty in all over. I'm guessing that it would take about 2 gallons or more to do this, and I don't know how easy it will be to get a decent looking job - I'll have to put a piece of wood or something on one side of each flange to hold the stuff in.

Any suggestions?

 

You might try calling Stainless Marine's technical support folks...they were very helpful for my bracket installation. They have probably seen many installations on curved transoms.

Jim