This doesn't address your question directly, but is an open ended question. If you're going to retire here and it's going to be your space, have you given true consideration to what you want to do in the space, and how it is configured?
I recently retired, and spend a lot of time out in my shop. One of the things that I'm grateful I anticipated is that I made the shop habitable, not just a covered area that keeps the rain off and most of the wind out.
I separated the "shop" from the garage. The shop is fully insulated and climate controlled, and I keep it at 67 degrees 24/7/365. It is clean and comfortable and I like spending 8-10 hours a day there. I also have a lot of open, usable space in it. I have separate storage areas and "dirty" work areas for things like welding, grinding, wood sawing and sanding, etc.
The garage is also fully sealed and insulated, but isn't climate controlled as much. It's comfortable 8 months of the year.
Your initial description described to me your needs as:
1) Nice clean, sealed shop with year round climate control to hang out and be "your space".
2) Garage area for working on one vehicle and/or projects, heatable with a wood burner and somewhat inhabitable.
3) Storage shed for yard supplies and equipment and items to maintain 10 acres.
I don't know what the shop activities you like to do are. Those should dictate what area 1 and 2 are built like, and their size.
I'd recommend the sealed shop area be at least 25 x 15 feet. That's big enough for workbenches on one wall, storage shelves against outside walls, and space for a large work table in the center. It would also be big enough to have some toolboxes and chairs or a couch, and a wood stove, or preferably a mini-split or such to provide constant climate control. If you don't have this improved space, you'll lose 4 to 8 months of the year where it's just not pleasant to be in the shop unless you just have to do something. By the time you start a fire, get it warmed up, get your stuff out, half the day is used up; plus it's hard to make yourself go out and do it. Same if it gets too hot inside to work by 10:30 and doesn't cool off till long after dark.
The garage area, I'd make at least 24 feet deep (30 would be preferable), and 28 to 36 feet wide. 28 feet wide would give one work bay to weld, woodwork, etc in and one vehicle parking/working bay. 36 feet would allow additional work area, or parking 2 vehicles.
If you make a separate storage shed for the lawn mower, weed sprayer, shovels, rakes, post hole diggers, chemicals, etc, you'll be a lot happier. Keeping that stuff out of your main garage is an incredible blessing and pays off in being able to work freely in the space.
I respectfully disagree with the bigger is better prevalent attitude; I downsized my shop to about half and once I got the excess stuff disposed of, have been quite happy with it. However, at 36x48 that is bigger than you are planning. The one thing I really regret is I don't have a shed for lawn and garden stuff. That's something I didn't anticipate correctly how irritating it would be in the garage space. I'll probably eventually build a garden shed to take those things out of the workspace.
