evansb,
With respect to restrictions on aerobatics when carrying fuel tanks, it depends on which tanks. If just 100g tanks on the inboard pylons then no. If Swiss 150g tanks or 230 g tanks on the inboard pylons, yes, and if any tanks on the outboard pylons then yes. A simple answer but I don't think that any more detail is relevant to this thread but send me a pm if you want hard numbers (so as not to have thread drift - nothing sinister!).