If I had to only keep two things, those two things would be a computer for designing, and a workshop for building.
Whether it be RC tanks or airplanes, all of my creations are products of me trying to satiate my desire to design and create. I also have a knack at taking stuff apart and reassembling them, especially if that thing is broken.
My most complex RC tank to date: a Leopard 2A4, measuring at almost a meter in length (excluding barrel)
A spaghetti bridge that I made in freshman year of college, spanning 0.86m. The only materials allowed were uncooked spaghetti, CA glue, 3D printing, and cheap fishing wire.
The target strength-to-weight ratio was 10 to get an A+.
My bridge's strength-weight ratio ended up at 130.
Bridge weight: 185 g
Mass held: 24 kg
Building vehicles from scratch using hobby RC parts, such as...
RC tanks out of plywood
RC airplanes out of wood and foam board
3D printing stuff
Designing/CADding during class
Drawing (traditional & ditigal art)
Collecting fountain pens
Playing tank games
Biking
My 3D printer- a Creality Cr 10
(which has been heavily modded)