To be honest, I actually kind of find it misleading for Briess to post those numbers. Diastatic power measurements, in particular, swing significantly from crop to crop. If you're just looking for averages, you may as well just put 150ºLintner for your light base malts, 50ºLintner for your kilned base malts, and 0 for everything else.
Always nice to have new resources. There's not much on your website yet, but if you assemble all the info together coherently and can offer something that the other lists don't, you'll find users. Good luck!