I wish you were close, i would cut 20 cup holders for ya out of a 10' peice of pvc pipe in 5 min flat..
I cant remember how many enclosures you have so im not going to try and talk you into trying it yourself hahahhaha...a small $8 Hack Saw with a metal blade cuts PVC easily with a little common sense and coordination ..the ideal saw would be a Chop saw with a small tooth blade, makes a Perfect cut.
All my babbling aside i'd say you got it nailed down.. I hate to see someone pay so much for a PVC cap but sometimes we all spend a little more for perfection.
I love LOWES, my girls wont even go with me becaue i can get lost for a hour in there lol. I have two 5' pieces of PVC 3/4" painted ripple grit brown that im going to install in my T12. Im going to drill a few holes and attach some reptile safe Vines/leaves onto the PVC branches along with a 8"x5" (scale model) tree swing im hanging too hahahahaha.