The underside measures 9-1/8" in the middle x 17-3/8" at the widest

No issues at all, like new.

Shipping is included, "free shipping" ebay calls it.  A signature may be required upon delivery because of all the package thefts these days.  If you want Fedex 2nd day shipping add $35 (optional at checkout,) otherwise it will ship standard Fedex Ground/Home.