IMHO, I'd go with Craig's idea. Flatten it all out into a spreadsheet. Work with these top notch guys to get the design right and import it all back in.
So you cost yourself some time with SAS. You have the formulas and points of measurements, so all the heavy lifting from that aspect is done.
I guess the overall consideration (measured in time, money, or whatever quantile fits) is whether you want to spend the time now getting it right or nickel and dime your time later applying bandages.
If retirement is a year away ... I'd go with the latter. =]
-dK