Looks good!! The PTM was my start into RC flying back in 2008 and it was a fun build and I learned alot. She's a great slow flyer. I just finished building my 2nd one after losing the first PTM two years ago to wind gusts.
What size is your battery? I was able to fit a 3s 500mah lipo in the battery compartment by carving out some foam on the sides. With my new Moth, I can fit a 2s 800 mah in the battery area by carving out foam on the sides and using velcro to secure battery - it's about 1.5inches away from the front of the fuse. I also use a 3s 900mah and 2s 1350mah but those are mounted similar to yours to the underside of the bottom wing. I do prefer having the battery inside for looks though.
Good luck on your maiden!!!
1st PTM which I learned to fly with back in 2008 (went MIA due to wind gusts back in 2009):
My new Moth finished 2 weeks ago and maidened over the weekend - made me wonder why I waited so long to buy another (I 3rd one still in its box):