Water Expansion Tank

I'm thinking of having a custom expansion tank made up to replicate the older style MK1 units but will fit into an MDA. My MDA in particular.
What points do I need to look out for ?
I have a few initial thoughts of my own

1. What pressure Cap should I look to buy. 19-20psi, 22-24psi or 29-31psi ? What determines this requirement.

2. What guage of aluminium should I fabricate the tank in.

Any help would be appreciated.

Martin
 
Martin, minimum 2mm thick with ribs in any flat surface greater than 100mm wide. Make sure the welding is perfect because I have seen a lot of tanks split at seems. TRY TO RESTRICT THE SYSTEM to 15 PSI if you have good cooling. You have some of our ali work ! Frank
 
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