I think the tubing is 6mm or 9mm. The only radiators i've seen are way to big for the case I had planed but oh well.

Today I started on the water tank. Pretty simple really, just small peices of plexi glass 8x10 in size. Just having a problem on gluing it together, keeps falling apart. Just have to do trial and error testing until I get it right.
To live is to let die