Final Cut Studio on Lion

Hi..I need some major advice, it´s a complicated situation so please bear with me.

Until recently I´ve been working on Final Cut Studio 2 on a 2009 MacBook Pro. Everything was going well until someone spilled water on my laptop and completely ruined it. I bought a new MacBook Pro 2012 (non-retina) and restored from my time machine back-up. I got everything back but my FCS 2 applications won´t work with Lion. All my project files are in FCP 6 and Motion3 and I urgently need to access them for a September deadline. I am halfway through this project ( 3 of the 8 films we have promied to deliver have already been delivered to the distribution company in England)

I don´t have the original FCS 2 install discs or serial numbers and I didn´t register my software with Apple. I realise this was very stupid of me but I am prepared to buy a full version of FCS 3 (if I can find one on ebay) if that means I can carry on working on my project.

I would defintely prefer to work with FCS3 if..

1. I can get a reputable copy from someone one ebay

2. I can install it over the top of my unregistered version of FCS 2 without any trouble

if neither of the above apply then I would of course consider using Final Cut Pro X and Motion 5..but will my earlier project files created in FCP 6 and Motion 3 work? I don´t like the look of FCP X and would much prefer to work in FCP 7 if possible.

My boss has an old Mac Book Pro with Snow Leopard (circa 2006 I think) with Final Cut Studio 1 installed. Obviously he cannot access my FS 2 project files. Would it be better to find an old copy of FCS 2 or 3 and install it on that machine and work on the project on that until the project is finished?

Any advice on this would be greatly appreciated, I hope I have made myself clear and I hope someone can help me

Thanks

Mike