For the straps, I'd recommend using exactly the same strap thickness and material as they used at the factory for whatever tank you are using. It needs to be thin enough to bend and conform to the tank, if it's to thick it will put localized stresses into the tank. I used some treated frame welting also between the tank and the straps.
I measured the straps on my tank and they appear to be 15 gauge... its a 15 gallon tank.
Hope that helps!
John
