S.e. X t.f.2. pl_space_enginieers

thingiverse

You're looking to bring over some advanced designs from Space Engineers to integrate them with Team Fortress 2. The primary hurdle appears to be importing models, specifically those developed within the space-engineering realm into TF2's project folder structure. It's likely that exporting a model or three from your chosen space-based world might be a good starting point, followed by organizing these items into specific categories as required for Team Fortress 2 integration, all in an effort to achieve that cohesive feel you're aiming for within the map.