Dennis
Welcome to your new addiction (as I was told ) & here
Looks like you have a pretty good start on things .
Hardpan LOL I just finished pick-axing a 9' x 9' x 3' hole for a FT and last two foot was rock and caliche
On the greenhouse ,if it were me . I would drop the roof some . Wash. doesnt get that bitter cold as the coastal winds help but it does get cold and you dont have real hot summers so if you plan on running in the colder months you will need to heat . Heat rises ! So here in Texas I should have gone with a taller roof ,there I think a shorter one would benefit you more. My painter just came back from Carnation last week said he left 100 deg here to wearing a hoodie up there !
Have A Kind Day
Mike