Outside in transom replacement

[CHANCE1234]

As many of you know I'm redoing my transom from the outside. Today I cut the template for a new transom. Looking at the stern of the boat the hull sides have a little flare to them. For those of you who have replaced from the outside did you just cut your new transom a little short on either side so it slides in without forcing it down. If that is the case do you just fill up any voids on the side with cabosil or its equal prior to inserting the new transom. Also, I will be adding more glass to the inner skin, would mat work for this or should I use woven? Did you guys add all of the glass you needed before putting it in place or did you add glass after it was adhered to the inner skin. If that is the case, it must be a pain in the ass to get glass in such a tight area without voids. A lot of questions I know but this is my first time doing structural glass work. Also I haven't used 1708 before and I'd rather alternate mat and woven to achieve essentially the same thing. I tried searching a lot on here but it seems it has been a while since anyone has done a transom this way while documenting it good enough for me to answer the above questions. Thanks guys. My rebuild thread is called "and away we go"

Elijah