DIY glass tank build questions

[Chrisrex]

Hey all,

I'm planning on building my own tank in the very near future of course it will be all documented for all to see. Before I begin with this project, I have some questions I need answering from my fellow reefers.

The plan

60gal cube
Short steel stand
Sump

Questions
1. I want to use the vertex Omega skimmer 130 or 150 leaning towards the 130 but need to know how much room the skimmer cup needs for removal? Reason being I want to have the tank as low as possible, so my daughter can easily see the tank.

2. What is the recommended size of the drain and return lines should be ?

3. What is the recommended thickness of glass ?

4. Should the glass be tempered after the holes are drilled ?

Thanks in advance I'm sure I will have more questions