Re: 50 by 60 design and layout
Put all of the cars on lifts where the yellow car is. Four lifts, eight cars.
This will leave the rest of the shop wide open.
Also, enclose the shop area to contain the sawdust.
If you don't do it now then you will likely never get around to installing the lift. That has been my experience, things seem to keep getting in the way.
Also, the resale shouldn't be impacted. You can always just pour concrete in the well prior to sale.