Sounds like a good idea. The sand idea is good too, but don't heat it. Just fill a tube your bending with it and it will prevent the kinking effect. And the bigger the pipe the harder the bend. I tried (and failed) to make a u-tube from 1" pvc
. Ended up buying them and boy do they charge at the LFS
for u-tubes. They are whacked out of their minds. I bartered some for some coral frags
because I was not shelling out $16 bucks for a plastic tube just because I wasn't getting the results I wanted bending it myself. Still saved about $50 overall making an overflow box, so DIY
triumphs again. Plus more fun.