$400 is the going rate for Toyota wiring harness conversions, too. I chose not to pay it and had an "experienced friend" do it for me; turned out looking like a rat's nest and half my warning lights were on for no apparent reason. Some things are just worth the cost.
Yeah, $10-11k sounds about right, and very much worth it considering the power and speed you get from that RB. I think I'm going to put this idea on the backburner for a while as I just found out that 3SGTE swaps for my MR2 have become much more affordable recently; it used to be $10k for a gen2 swap (200hp/200lb/ft), now it's around 6-7k for a gen3 swap (241hp/224lb/ft), and that includes the modifications to bring it to around 300whp. Considering my MR2 needs an engine and my Z doesn't necessarily need one right now (just refreshed the ol' L26 and rebuilt the Webers), I think I'll wait a while, sell off the L28ET stuff, and put it in the piggy bank for later, when hopefully, hopefully RB swaps will become more affordable.