Jim,

I thought I wanted the 24' totally open, but I'm thinking now that I will use two shorter 8' sills on the front and leave the center 8' open. Great idea!!! Thanks!

For the rest of design, I will use 4 bents, spaced 8' OC (to flank each side of the door way. To address my concerns with providing stability to the posts at the entry of the building to the sill, I will add a couple of struts between the post and sill.

I think I'm now ready to draw up my plans. Thanks so much to everyone for the help. With your help, I was able to problem solve the building, making it better then what I had come up with on my own. Not to mention I won't be needing 10 x 8 floor joists :-)
Best Regards,
-David