Retro Mobile Phone

Went to a car boot sale a few weekends ago and bought 2 1970's/80's rotary dial telephones for £10. My intention was to polish them up and sell them on e-bay, but they only make about £10 each and whilst 100% profit may sound good, after the 2 nights of cleaning and polishing I grew quite fond of them!

I had a quick look on the net to find out how to make them work with a modern telephone system - like what Sky provide me. I then thought that it would be really cool to have one of these phones as my mobile phone :) I then came accross this site:
http://www.sparkfun.com/tutorials/51
Awsome instructions on how to do it!!
Upon first reading this project sounded fairly straight forward - they certainly made it seem so on the web site...
My plan was to loosly follow their instructions, mainly because I didn't have a C compiler for MPLAB - more on this later.

Plan

Get the required components

Port-a-Rotary uses a GSM module - I plan to try and reuse an old Nikia 6010 - or whatever it is.

Create a high voltage ringer from a battery cell (3.7v) and test in isolation.

Check that I can control the Nokia from a Hyperterminal to simulatre the AT commands

Program the PIC 16F88 in assembler for the pulse dial to phone command

Solder it all up on Varoboard so it is small enough to fit inside the casing of the rotary phone.