Simply FABULOUS shop . . . and thanks for sharing with GJ !!!
Think you're the guy I recommended to start a new thread to document your shop build . . . . and WOW, it's turned out incredible !!
One comment I had was that 500 gal LPG tank wasn't going to cut it if your monthly useage was 350 gal. See now that you've upsized to 1000 gal, and curious if your considering adding back the 500 gal, or yet another 1000 gal so you can bulk buy in the summer when prices are lower??
Other curiousity questions:
1) Did you consider blown cellulose in the walls so you'd get even less air infiltration and greater R value??
2) Satisfied with insulation in ceiling or consider adding more to get to R60?
3) Any discussion of vapor barrier on interior before the steel went up to further make the building airtight??
4) Did you ever consider making whole building "Drive-Thru" so back of building would have door and connect to other driveway on property?? (This would making driving motor home, or vehicles pulling trailer easy to get through building.)