Using Seacast or similar with 5in" Tarnsom Increase

[Rybones]

Hi All, I know this is a can of worms topic. I have read all the forums and talked to a few end-users as well as a manufacturer. I have talked with old school guys on both sides of the coin, that it's acceptable and that it's an abomination. I'm leaning to it's acceptable in specific applications and only if done absolutely correctly. Meaning removing ALL wood and properly preparing the surfaces for a proper bond. It is a 1974 20-foot SF with 2 stroke 150 with a 5" setback hydro JP. The boat is all original, unmolested and all the glass is in absolutely excellent condition. I want to keep it original and not cange anything except transom height. But I know I have some rot around the engine bolts in the transom and I'm getting a nominal amount of flex in that area also. So something needs to be done about it. What I would like to do is go with Seacrest or Nida Bond or Arjay, but I also want to raise my transom notch by 5" as it's the old 20" in transom and I want to go to a 25" in transom. I'm looking for recommendations or better yet instruction on how to create the skins to fill it up 5 inch Gap between the transom I have and the transom I want. I need to create and install the skins and form it to pour the seacast or similar product. I'm good with the preparation of the transom and the pouring of the seacast but I hope there's someone in this form that has done specifically this before and will give me step-by-step instruction as to the fiberglass skins and forming. Plus specific materials, amounts and tools I would need for the fiberglass aspect.

I know there is a tremendous ammount of knowledge here and opinion here but I'm not looking for dicussion of if its right or not, I am simply looking for information on how to raise the transom and glass with porable product.

Thank you all inadvance for your input.

Cheers, RyBones