I'm looking for something that will help me do airships and seige engines. Ideally the source would work ok-ish across versions (OSR, Pathfinder, 5ed). Basically a good vehicle thing with overland and combat rules.
Also, on VTT I've handed airships very awkwardly, usually making the PCs airship the center of the map and moving layers, making a huge token, or drawing and redrawing enemy airships. Sometimes I've run two maps at different scales. I'd just like something where, the next time I'm running and this happens, I have something that's coherent enough that the players can design and optimize and stuff.
Any suggestions?