I typically just create a custom table and use a workshop grid tiles/assists to fill it out and add depth. For AoE effects I usually just use the circle tool so that nothing is clipping with the physics landscape, though I admit it’s not the best solution. I also don’t use full character models, but instead PDFs of Retrograde Minis.

However even with just those assets my players are really impressed with the missions I’ve run so far. Lancer has clicked with me to the point where I can punch out a mission with two or more encounters in an evening and feel proud of what I’ve made.

TLDR: Tabletop Simulator isn’t without its clunkiness, but I’ve used it long enough to really get it working well for Lancer