I'm not why there's a issue with building it with a projector, the entire bottom is one level of blocks, the axel areas are two small batteries. All the major components are positioned on that first level with sides attached to the Survival Kit and O2/H2 Generator. Only block that might be a issue is the gyro...

Great rover! As Emiricol4Rl, I also had some issues building it with projector. I also used Build and Repair. I had to place some itens manually, like the O2/H2 generator (back right) and programming block (back left). About the parking brake thing, you need to change the block to the pilot seat and select brake from there. Some armor blocks near the wheels can't be build as well but not a big deal. I added another programming block so I could use Isy's Refuel script to manage battery charge when docked.

Hmm... It should be. Try pressing P then pressing 3 for the brake, it's known to not be properly set up by SE default. The version I uploaded had the brakes on with the 3 key already set and good to go. Unless it's not set as the parking brake at all, and if not, then that's even stranger since I was just using the same vehicle a little bit ago. Did you build it from a projector? That could be a reason for it not being properly set up.

My point is that it isn't the parking brake at the moment.

Yes, the 3 key is for the parking brake. It's a standard for all my rovers so that you don't have to use P since using the P key disengages the connector as well.

I assume that control seat button 3 is supposed to be the handbrake. However, it currently turns all wheel braking ability on/off.

That's weird... The only large blocks on it are the Survival Kit, O2/H2 Generator, Control Seat, and Connector. Everything else should be one or two blocks, the bottom is half block and the "axel" areas are small battery. The entire bottom is one level, try setting it up to one of the small batteries and go from there.

Hey, I tried to build this via projection in survival, and some of the pieces aren't weldable. Mostly armor, but one big internal block I didn't dig in to identify (but it's toward the rear). Maybe the survival kit? Might want to test that out, if this is intended for survival! I tried it even with the Build and Repair System to make sure I hadn't just welded it poorly, but they still won't light up as weldable. Still looks awesome, though.