PAINLESS ...
I stumbled across an excel spread sheet that does exactly as you describe, but not by type of plane, just some real general design guidelines. The one thing it does have is a CG calculator for many different wing planforms, even biplanes. Very handy.
I am interested in taking a look at this spreadsheet as I have a biplane glider project on the cad that I would like to compare the "spreadsheet" data to my own ... and see how smart I really am ... or "STUPID" depending on the results ...
if you can post a link to it, I would apreciate it or maybe just e-mail it to me.
Thanks in advance.