I am planning a new work shop and garage and have been thinking about layout and flow between machine tools, presses, welders and separation of work areas and vehicles being worked on.
It's always a good idea to have an area separate to store vehicles whether with walls or with full length curtains helps to keep debris, chemical splashes, spills from getting where they shouldn't. If planned for and it never happens I figure it is cheap insurance...
Flow work areas from cleanest down, ie don't put polishing your car next to grinding on a frame/welding.
I second the tall work areas/benches, one of the best things I have seen is an electric scissor lift table, smaller ones can be had for as little as a few hundred dollars.
It is always a good idea to have a fire extinguishers hanging in the center of a RED BOX or a Red Arrow indicating location. ESPECIALLY If you have others in your garage who are not familiar with where you keep safety equipment.
Remember*** You can never have too many electrical outlets or air disconnects.
If you have blasting cabinets etc with cyclones/vacuum dust collectors place them in the external air compressor enclosure as well, your ears will thank you for the reduction in DB.
I thought 3000sqft was enough but now I'm thinking more...