So yours is the same size as mine.
I like the 12 x 24 size.
Could you just leave the 2 doors on it?
I have had good luck buying and selling things like that on Craig's List.
I got a free door from the old shed that we helped tear down, and I'm going to use it to make a workbench. Like Pat/eregel suggested, I'm going to get a couple of old cabinets to use as a base and put the door on top.
I love Craig's List! I also got 10 free wood pallets the other day! We'll use some of them to put under our stored hay bales, but I can use the extras for some sort of project.
Anyway, good for you on building your shed!