62-Racer Transom Help

[65Bowrider]

Our transom will be raised 5" for 25" shaft twins.
Using epoxy (better strength & adhesion to old fiberglass)

Ok, so use some thickened epoxy to fill air holes, then apply wetted 1.5 oz (not 3/4oz) mat to transom skin.

Then it's been recommended to add 2 layers of 1708 to transom skin to beef her up, bringing each layer 3" past previous layer. Can this be added soon after the mat, or will there not be enough time before mat sets? I've read/heard the chemical bond is the best.
And again, how to handle these big sheets? Just put sticky hands on all corners? or do you try to roll up then unroll on the transom? Amazing how much & how little I know!
Please keep the helpful hints coming ... Thanks.