Great looking plan.
Things to think about:
1) I don't know if you are in a cold part of Texas or not. But if you are I would strongly consider putting in in-floor hydroponic heating. It's the biggest mistake I made in my shop - not having it. I'm on my feet a LOT in shop throughout the winter and it gets pretty brutal. The rest of the shop is at 60...but the floor is ice cold. But then, maybe you need A/C more than you need heat.
2) Just be aware, when you put running water and a bathroom in your shop it will most likely bump it into a different category for tax purposes AND for insurance purposes. Both will be more costly than just a plain old garage. At least that's the way it is here in WI.
3) Before you decide on a final ceiling/roof height, think long and hard about a lift and the design requirements for that particular lift...and the vehicles you will be lifting. Some require a 12' clearance to function properly.