The screen shot posted by Stephen shows a lot 150 x 200 feet, approximately the same size as the Sheepscot lot. It includes 71 parking spaces, plus a hitching rail at the right end for horse and buggy users. This is the Manheim Township Public Library near Lancaster, Pa. By eliminating the landscaping and the center island, at least one more row of slots could be included, adding perhaps 18 more spaces.
Using the standard numbers for parking lot construction as established by the Manual on Uniform Traffic Control Devices, it appears that our lot could theoretically include 100 parking stalls 18 feet deep by 9 feet wide. Roadways between the rows would be 15 feet wide. On the north end, there would be a 25-foot wide roadway to accommodate bus and camper parking along the north edge while providing a 15-foot roadway for travel, and at the south edge, along Cross Road, the roadway would be 20 feet wide as well.