Wanting to build approximate 40'x60' around my current 10'x15' well house/tank.
Looking for recommendations on prefab and what lessons have you learned?

I'd first check with MFBarnes.

Thanks for the great input. Apologies. Let me clarify...actual well head is about 180' away.

In 2017 I moved components (pressure tank, booster, softener, pump saver, etc) toward the back of the property and added a 2500 gallon storage tank. Also ran 100A box from the house to power the components (currently using 70A).
Tank is currently exposed, components have small insulated shed built around them. I want to enclose all of it and remove the little shed. I will have roof access if I ever need to access top port of storage tank.

Curious if anyone has experience going with stock/standard dimensions vs custom and who you've used.

bump since my initial information was misleading....

I would still prefer keeping the two separate. You still have a pressurized water source that with any issue could flood or soak the rest of the shop area. I currently have an 8' x 8' well shed and a 40' x 60' barn. I see no advantages of combining the two.

The vfd and valves for my well are in my shop bathroom. I love it because I have a small space heater to keep everything from freezing (woke up to -9 yesterday morning).

I wouldn't change anything about my set up. My previous place was set up similarly and loved the set up there as well.

With "remote" controls and pressure tanks, it makes it easy to set up water softener, pressure regulation and control the environment. Keeping everything climate controlled should make things last longer and much easier to plug and play when replacement/repair is needed.

Lots of folks in our area do that because of the cold temperatures that can be experienced. We are -2 this am and have not been above 20 for a couple of days.
Many ranches here have their wells, pressure tanks, water softeners, etc built into a corner of their shops. When pouring the slabs they lower like a 10 x 10 or 12 x 12 part of the slab down about 3-4" and put a floor drain or a way for the water to get out in that part to prevent flooding of the rest of the shop in case of a catastrophic water leak.
This set up also allows the well and plumbing to easily be heated as to the rest of the shop and it's convenient for installing a bathroom as all the plumbing is right there as well.
When building the shops like this they design the roofs with a 4' x 4' framed opening with an easy provision for well trucks to service the well.
ETA: I will add that our house here has similar slab designs as both water heaters and our mud room/laundry room have 4" down-set in the slabs with large floor drains to prevent flooding of the rest of the house in case of catastrophic water events from the water heaters or washing machine.