With the cheap
digital type inverters, it's worth getting one a fair bit bigger than needed, so you don't drive it too hard (they don't last long if you do).
As mentioned above, there isn't that much difference in price
(and modified sine wave are pretty cheap
anyway). I picked up a nice 2kw/4kw 12v to 230v, for just over £120 (it actually cost me £10 more than the 8kw heavy duty pure sine wave I sniped on Ebay, believe it or not). It'll run a 1kw oil
filled radiator on the 400w setting, til the cows come home, with no sign of overheating
Those Sailright sound interesting, I'll have to look into one. Also, any good books
on DIY sail making around?
Good tip on the double sided tape by the way.