My suggestion would be to get Gary to supply and wire in one of his 12 channel Power Distribution Modules. It would eliminate the need for fuses and relays etc and make your wiring job so much neater.
Whilst the initial purchase price might be a bit daunting - I can guarantee that by the time you buy relay mounting blocks, fuse holders, fuses, relays and start wiring it all in, you'll have wound up spending almost as much as what you would have been charged by a professional to put one of these 12 channel modules in.
Gary would also be able to supply you with all the bits and pieces you'd need if you were still wanting to do the job yourself and they are quality items.
Cannot recommend enough that you should give him a call.