A bracket for 25" 150hp on 20' CC- Pros & Cons?

[captinseafood]

Hey everyone. I'm seeking advice on adding a transom bracket to my 1974 Potter 20' CC. I have to do the whole rehab this fall: replace the WHOLE deck, mod the rails and replace the fuel tank. I did the transom 2 years ago but now since I'm re-powering (great deal on 150 Ocean Runner) with a long shaft I have to mod the transom as it is for a short shaft. Since I'm cutting the deck up any way I'd like to re-do the transom with no cut out and add a bracket. Here are my biggest questions:
-Can I glass in ply over the cut out? Strong enough or do I have to re build the whole transom solid?
-What is the way to go- Glass bracket or Aluminum tube style?
-Are trim tabs necessary with a bracket?
Thanks in advance for any info!