I was giving a couple neighbors a tour of my forest garden and while doing so told them about the walnut grove. They expressed an interest in doing something similar to each. I offered to lend them any needed assistance in a sort of off-handed way thinking that they would do like most folks do, and lose interest before the sun went down or shortly thereafter.
Well, so far it looks like they haven't lost interest and have requested assistance/consultation in developing a ~2 acre forest garden/walnut grove. A meeting is planned for Sunday afternoon to walk over their place, determine as many particulars as possible and make a very large order from Willis Orchards Sunday night with an emphasis on establishing the canopy layer. The canopy layer of the forest garden is likely the only thing we will have time for this year given how late in the season we are getting started with their project and the size of the garden/grove they want to establish. Following the Martin Crawford recommended spacing, an acre of standard sized fruit trees planted at 1.3x the recommended spacing will require 90ish trees per acre (if my quick mental abacusizing is accurate at this early hour).
Their property joins our own. They are starting in their back yard as we did but are about 1/4 mile away. It might be really cool to one day have our gardens meet up in one continuous, whole-ish sorta-thingy.
I will keep everyone updated as the project proceeds.