Next point - tank levelling

[golf nut]

Originally Posted by Aquattro

Except once in place, I won't be able to get to the back edge...but I think I should be ok, the reaer centre is sitting solidly, so shimming the corners should suffice. I hope

The 4 corners are more important to be solid than the center, I really believe that doing the corners rigidly is better than shims that may give and leave the center as the main support.