I'm making a ganached cube to be a table, and need to drape fondant on top to be a tablecloth. How should I support it to get a realistic hang while it dries, and also how do I avoid ripped corners given that it won't reach the cake board? Can I make a much longer drape and then cut it with a scalpel when it's dry or is that asking for trouble?!
I would drape it while fresh and add some rolled up kitchen roll or bubble wrap to hold the form while its drying. I definitely wouldn't attempt to cut it when it's already dry, it could tear quite a bit.
AWhat Claire138 said, no problem to precut, drape the fondant and support it with paper towel etc. I often use Tupperware or my own clean set of kids' wooden blocks to give height to my supports around cakes or models, and then use paper towel.