I gave you an account Sammeh and assigned you the calculator part (I think it'll spam you with emails with instructions about how to log in, etc., but let me know if it doesn't). Probably what makes most sense is to set up an aspx page locally and get it working, and we'll worry about the publishing ("going live") aspect of it later. Something in PHP might work, but I imagine interfacing with .NET assemblies is difficult since it probably involves some marshaling, so probably doesn't make sense to go down that route.
I'll try to remember to be on IRC and/or skype tomorrow, though our timezones are a bit incompatible so there's probably only a few hours in the morning (from my perspective) where I can be useful. Anyway, I'll try to check in a web project under Azimuth and set up project paths and stuff (which are a whole can of worms I don't really want to get into) and write some instructions here on meta stuff like which solution to run, which things in Azimuth to connect up, etc. The rest you'll just have to play around with and google and stuff.