Looks to me like your doing a good job It's always ojt anyway.Everone has their own methods,and most usually work out well.
Like you,I did my transom(I/O) from the inside on my 74 Tsunami.I cut the rear of cap off from the hawse pipe to the stern to access the inner transom.
After I removed all the rotted core I applied a layer of mat and a layer of 1708 to the exposed skin to thicken the glass up a bit.
I two pices of 3/4 marine fir plywood glued together with epoxy for the transom core.
I bedded the new core on to the transom skin with hull&deck putty and clamped and bolted it all in.
It was an outdrive so i was able to place some bolts where the drive cutout was,and the other bolts were place above the waterline.I figured it was one less thing I'd have to fill later on.
After all was cured,I layed up a few layers of 1708 over the core and into the hull sides and bottom.I used Polyester resin.
I glassed the cap back on and faired everything back in.It was a lot of work from the inside,but I think it has less of a chance of affecting the integrity of the hull,as you don't cut any of the outer hull skin off.
************************************************** ********
ROTTED BILGE/TRANSOM
STARTING THE OLD CORE REMOVAL
OLD CORE GONE GLASS ALL GROUND CLEAN WITH #24 GRIT
MAT & 1708 LAYED UP TO BUILD UP GLASS THICKNESS
NEW TRANSOM BEDDED IN
CLAMPS,BRACES,ETC.
LAYING UP NEW INNER GLASS SKIN
FINISHED SKIN, CUTOUT MADE,NEW ENGINE BEDS MADE/INSTALLED
FINISHED BILGE/TRANSOM
RECORED TRANSOM CAP I GOT RID OF THE BAITWELLS
ALL GLASS TIED BACK IN CAP ON ENGINE IN.
