I have built more Midnight Expresses than any other single rocket design, and I've built them in a whole range of sizes, from MicroMaxx to high power. Here are a few of them.
In the first picture is an arrangement of TDD version MEs. From left to right they are a micro downscale, a mini-motor downscale, the original size and a 348% upscale.
Next is a closeup of the MicroMaxx downscale. It is just under 4.25" tall. The fin root is 19/32" and the fin span is 3/8". The nose cone is 1/2" tall and the body tube is 7mm in diameter. I have made several of them.
Next is a photo of my Mega ME. It is 41" tall, 2.6" in diameter and it has a 38mm motor mount. The body tube was made in four sections, and each section consists of 5 layers of cardstock, one layer of poster board and one layer of heavyweight photo paper. The top section is a payload section. The fins are solid basswood covered with photo paper. The nose cone is printed poster board with a layer of fiberglass added to the inside after the entire cone was constructed. I followed the established Midnight Express building methods as much as possible, so that, for instance, the nose cone shoulder is made out of several layers of rolled cardstock. The centering rings and bulkheads are hand-cut from basswood. The motor tube was rolled from cardstock, as were the 3 couplers for the 4 body tube sections. The recovery system, however, is not hand-made. It has a 15' length of tubular Kevlar for the harness, a Kevlar flame blanket, U-bolts and quick-links for attachments and a 32" SkyAngle parachute. I spent several hours every night for four months building this beast back in 2005. It weighs ~ 28-32 oz. fully loaded, depending upon nose weight (which is adjustable with fender washers). It has never flown, because I have not yet obtained my Level 1 certification.
The third photograph shows a couple of my micro Midnight Expresses standing in front of one of the Mega's fins. The fin root on the Mega is 6-1/8" long and the fin semi-span is 3-1/2". The fins are beveled (just as they should be), are 1/2" thick at the bottom and are mounted TTW. The nose cone is 4-15/16" tall.