I got inspiration for loop and then I must studied how to use Blender. Ending result is horizontal loop. The block piece is:
http://ftp.cqfd-corp.org/wania_st2.tri(It is modified version of wania_st1.tri, so GPL too)
And first track using it:
http://ftp.cqfd-corp.org/horizontal_loop.mniThis track is possible pass under 10sec, but I put goldtime to 15sec so you can make extra spin/twist before finish.
It is possible to bypass loop (over or under), but I can't manage bypassing under 20sec.
If you want use this block on your editor add text 'wania_st2.tri' to mania.cfg (e.g. after wania_st1.tri). It is quite big block, because it contains sloping for both ends.