You have to remember, people look at their E30's differently to others. Where as most can look at them and know they're festering turds, others think differently and that little bubble on the rear arch just needs sorting and its mint...
I'd say a list of definitions and meanings would help but thats going to the extreme.
Maybe the more it developes, the more you can add... Maybe a points systems of some sort in terms of bodywork, going over the whole bod, marking it up and down for dinks, scratches and rust.
Everyone needs to remember, if they're car comes back as £1000 more than what they paid, that doesnt mean its worth that much.
Personally I would remove the sound system part as every other brothers car on here has a sick sound system. When I look to buy a car, thats what actually marks it down in value.
Again, just because the guide says its worth xxx amount, doesnt mean it is worth that. Its a guide price that is early in the making and the majority of people saying they are in profit, I can happily say if I was to go by the guide, looking at your cars, it would come in at a lower figure 
