Installing Glass Shower Door and Fixed Panel

I will be installing a 30" hinged shower door attached to the wall and a 30" fixed panel across a 60 inch straight shower opening. The unit is frameless, so the fixed panel sits in a u channel on the bottom and the wall.

Any tips/tricks on getting the door and fixed panel installed & lined up?

One reservation I have is that the instructions have me drilling 1 1/4" holes to anchor the u-channel to the shower curb. I am pretty sure if I drill this deep I will be piercing the rubber membrane underneath!

Also if I don't hit a stud when I mount the door hinges is it acceptable to drill and use plastic anchors with the 2" screws (I have 1/4" thick limestone 12x12 tiles mounted over 1/2" hardie board)

Stump the Pros?

Did my questions stump the pros? I hope not, I know you guys can help me here.

Thanks

Check out www.johnbridge.com. I think you'll get more exposure to tiling pros there. Lots of good plumbers, and some general contractors and electricians here, but not too many tiling pros...John Bridge's site is dedicated to tiling things.