lol, welcome on board mate, To be honest getting the kit is just the beginning. You would be looking at a lot of other items to get it finished it. so realistically I would say for a very good build, you would be looking at between £7000 -£10000 with the zetec route. Pinto would be obviously cheaper. I have spent about £5500 so far and still do not have the exhaust system, windscreen, rear diffuser, wiper motor and finally IVA and registration.
This is my first anything mechanical and I have been ok. Alot of reading and asking questions. So it looks like your ahead already so would be more than ok. To be honest most of the issues arise around conforming to the IVA requirements.
HTH