Hey man, this is so cool!
Thanx a lot for your help! I could finally make surfaces on the hole spline cage. Great! Another problem occured though. After building all the patches/surfaces, one have to rebuild them uniformly. While doing so, some of the adjacent patches disapear.
I wander if this could be in account of the curves not having the same number of spans? What do you think? Anyway, thanx a lot again!