Job hasn't been completed yet, but the cost from the POCO to trench and install (transformer and all) etc. ended up being just over $6200. Keep in mind that's just the POCO cost for build out and install, not the cost to build the house etc.
The design was not billed by the foot. The entire distance ended up being 157' on the plan/design which breaks down to about $50/ft.
I suppose if I had more time and it was an expectation, I could have done it myself and/or contracted all or some it out. But there's guys that do this every day, and have experience, and I'm glad to pay the price to get that experienced and knowledgeable install. I have a few pictures of the cutting/trenching done in my primary thread as you saw.