Do it all on the computer!
Get a copy of Cakewalk Music Creator and you can input the sounds a variety of ways, convert them into different instruments, print the notation, and so on! It multitracks as well - it may take you a whiley to learn how to use it though, it's a complicated piece of software!
I'm not sure I answered your question though! It sounds like a very involved, complicated project, good luck with it!
BTW, yu can hire instruments for a week or so, usually from music stores who are hoping you'll buy one!