So... I'm an old player in SP and did participate in a few RP's around here. I do have some builds that could see a new life if there's enough interest.
Here's a couple of builds:

Tanks
https://www.simpleplanes.com/a/wFi6g7/KpfPz-IX-Taika-A3Vaultech
https://www.simpleplanes.com/a/CqnC3v/PzKpw-V-Panther-Coelian-test
https://www.simpleplanes.com/a/zno9lS/Boxer-SPAA-HAwk
https://www.simpleplanes.com/a/jF3J3I/P-068a-105a-MOD
https://www.simpleplanes.com/a/O57x27/Vaultech-M-A-RCS-turret

Airplanes:
https://www.simpleplanes.com/a/5jj044/M-A-Red-Arrow-B3H-R1-FACH
https://www.simpleplanes.com/a/T1gqW0/M-A-Red-Arrow-A5DAIM-54X
https://www.simpleplanes.com/a/j90D4H/M-A-Raven-A10A
https://www.simpleplanes.com/a/M0Rz04/M-A-whatever-Deep-Intruder
https://www.simpleplanes.com/a/hzf3pd/MF-220-C-4d-Drachen
https://www.simpleplanes.com/a/e6UgYD/M-A-Dragon
https://www.simpleplanes.com/a/5F50h0/BMW-018-B