Welcome to the forums!
Do a search here on the forums for #Rotor's design. Those blocks can be made pretty quick, no special tools or machinery and they're effective enough. Here's the link with the rig I made yesterday, all but fan shroud made in one day:
http://forums.procooling.com/vbb/sho...&threadid=5799
Good luck!!!
/edit: here's the sorta howto for those blocks. Hope it helps
http://forums.procooling.com/vbb/sho...p&pagenumber=3