1. To be able to post a classified you need to be a gold member
2. Don't bother with a rep, the insurance will cripple you (sorry if that sounds nasty but that's the truth)
3. Yes tell the insurance company everything! If its different to how it left the factory, its a mod and needs to be declared, no harm in buying bits and storing them ready for when you have a NCD of your own
4. Keep an eye in local classifieds for one, dealers occasionaly get this sort of car in a "part ex to clear" way, might be able to get one cheap like that.
And lastly, welcome to PF!!!