Normally I'd be a bit dubious about something like this but to be honest I can clearly see where Solar Steve is coming from. The fee is peanuts in reality & worth it just for peace of mind if nothing else. The bigger he gets the more chance of the subbies getting good work from it. Good luck to him I say. He's put the effort into gaining the knowledge & contacts so IMO the fee he's charging is more to do with covering costs than making money on it. If it was closer to me I may consider it, not for domestic arrays but certainly larger contracts.