There are many reasons why your spreadsheet hasn't garnered more interest.
1 This Forum is more kite flier than kite builder. Yes, we have several people
who build kites, but most of us just fly them.
2 Not everyone has a spreadsheet program.
3 Your spreadsheet contains macros, which I avoid, regardless of the source.
4 Many people start with a kite design they like and make mods based on how
they want that kite to alter its habits.
5 Some of the purists may want to keep hold of a notion that kite making is
more of an art than a science.
6 Have you tried the Kite Builder's Forum for feedback?
And on a personal note, have you put in factors from known designs (Nirvana, TNT, etc)
to see how closely they fit to the program?
I use spreadsheets on a regular basis, and while the program appears straight forward,
the use of macros and my own resistance to building will keep me from looking into it.
Thank you for posting.