I've built a tank haha sorry I'm not on here very often
If you're still doing this i'll try and respond to as much as possible
What style overflow are you doing? what adhesive are you using?
definitely a good choice of skimmer I'm running the 150 myself
also that's a good link posted for thickness i used the same one to figure it out. basically the higher tank you make the thicker the glass will need to be
Here's my build link if you wanted to take a look:
http://www.canreef.com/vbulletin/showthread.php?t=97962