Here's my most recent spelljamming ship, the dragonfly. I may add legs later when I build the lower deck, but here's what I have so far.
I have the dragonfly ship in one image, but I also split it up for MapTool for the main body if you don't care about wings. I added the wings separately which can be duplicated and flipped in MapTool to save space and load time.
Ship includes a light catapult and a tail that doubles as a ramp or stairs depending on the position. When landing on the ground, the tail can be lowered allowing access to ships deck. The stairs collapse forming the ramp when in the upright position and is used when boarding other ships or docking.
The forward wings rise above the deck and the lower wings fall below and catch the air currents generated by the spelljamming helm. Guide ropes, not shown, help steer the ship better with move class of C, but the spelljamming mage can manage without a crew but suffers a movement class of D.
Two cargo covers allow access to the hold while the stairs down lead to the crew quarters.