Sorry for the late response. I'm tech tarted and haven't learned how to use the "@" type stuff yet.
I get these questions all the time and for anyone else reading this do not skip step one.
#1) Come to me prior to tile. I would of advised to add kitchen metal or wood blocking in the locations that are to receive the hinge hardware. If the wall is completed prior to installing structural blocking you will be relying on the backer board and tile to hold your door up. Ive seen a few fall down over the years when the only thing holding them is tile/screw plug/drywall. Good news is you have hardboard that's much better than blue drywall.
#2) Thickness of glass. Without dimensions I'd guess your door is about 28-30 x 72-80. If it's within that range 3/8" clear tempered will be fine. If it is taller - let me know and I can run some deflection design load reports.
#3) Glass. Stay away from any film or liquid applied "water spot" coatings that minimize spots or mineral deposits. They are all a sham IMO. I can get you the same crap for $10 a bottle - it's basically just high quality Rain-X. If you truly want lifetime protection from those deposits (recommended if you have hard water - waste of money if you don't have hard water and don't mind spots) you want ONLY Guardian ShowerGuard
Shower Glass for Enclosures & Modern Bathrooms - ShowerGuard
It will add a few $$ per sqft, but nothing crazy. It's the only stuff that actually works and will not rub off over time. It also protects from scratches better, but who the heck has something in their shower thats going to scratch glass anyway.
If you don't care about water spots just have them buy you 3/8" clear tempered glass. You can add Rain-X yourself or if you want commercial type stuff we use grab some of this
TPC16 - CRL TPC Surface Protector - 16 Ounces. I use it on all my glass (car windows/house windows/showers/etc.).
4) Intent and use. What is your intention for this? Use it until the day you die? Make it look good to sell the house in a year? How long do you plan on being there? Do you have kids that will be using it? Will your wife need to use it to bath your kids? As much info as you can give me the better so my recommendations are more suited to your specific needs.
#5) Design: I do not see a vent fan within the shower stall. If this is true in no way can you block off the entire opening. It will become a moldy nightmare. You must allow the moisture to get sucked out by the fan. For this I advise keeping the door short of the ceiling by 6-12".
I could go on and on so to avoid that - get me some dimensions, let me know where the fan is located, let me know if you plan on having a "steam shower", and then Ill take all that and recommend to you something I feel would be best for the application then draw up a design and spec some hardware for you. Should help you get "apple to apple" bids from subs that you can actually compare because they won;t all being doing whatever they want and will have to follow our lead.
Ill PM you my cell #. Feel free to call me anytime to go over any of it.