Sea drive transom repair? Sea Cast?

[bkurtz5001]

I have an 85 center console V20 sea drive. The sea drive was removed and a custom bracket and a 200 merc was put on by the original owner. Recently in slightly choppy conditions I have noticed the transom flexes and the stringers on the inside do as well. I noticed this by looking at the inside of the transom through doors to access my oil reservoir and bilge area. I am almost 100% positive I need to redo my transom. However after researching the seacast stuff I cannot seem to find an example of application such as mine. Could I remove the gunnel cap and bow rail all the way around the boat and then do the chainsaw thing (sounds bad). Would Seacast be the best method? What should I do with the stringers? Considering im still in school, I need to go the cheapest route and at the same time I would like to do it myself. Any suggestions let me know