G'day Buckeye,
Welcome aboard mate.
I originally hail from Armidale but left there when I was little to move to God's Country - Queensland, with my parents.
Mate I don't know if you are aware of it or not but there are a lot of ex US Servicemen out here. Our women just seem to love em.
Re the ply, I would try Australian Wood Panels in Brisbane. I will try to find a link for you. I get all my ply from them and they are real good to deal with.
There is no need, IMHO, to go to the expensive marine ply but if you go that way, I would recommend Gaboon.
Where are you planning on paddling? How many people to you expect to take? You are pretty close to some spectacular places down that way.
Rethe glass, I use only 85 gram woven matt and it holds up just fine.
The 200 gram stuff is much harder to wet out, requires and awfull lot more resin and to be perfectly blunt, is a SPAM to work with. I used it on my Wadefish and will never use it again.
I get my woven matt from Whitworths on line and while I have heard good things about the Bote Coat epoxy, I have never used it.
I was using International HT9000 for a while (also available at Whitworths) with pretty good results (I think)

but have found System 3 from ATL Composites to be superior in every way.
I'm not sure what they are referring to in "Pacific Maple" I think they probably mean cheap exterior grade bracing ply. That also works very well but is fairly heavy for its thickness.
Good luck mate, & Keep us posted.