Looks great!
Epoxy glue is only way to go with wood that will be varnished.
We use the marine version,but any kind should work fine on a window frame.
If a joint does not show we use 3M 5200.It will shatter wood,fiberglass,etc, before it lets g
nly problem with 5200 is it takes a few days to dry unless you get the quick set.We do not use quick set,better to give wood time to soak it in.
Anyway,before I get started on boat repair lesson,I will shut up.
Your metal fabricating skills are fantastic.[
I wish I had half your skills.My trade has always been boats,so my skills are with wood and fiberglass.
I can stick weld OK,but I get someone else to do critical mig welding.Makes my builds take longer,but I know when to step back and let pro weld.
Can`t wait to see your coupe body done.You must be very proud.I know I would be.