Sort all parts into labelled bins before starting. Lay out every printed part, hardware bag, and component so nothing gets lost mid-build.

Using a soldering iron set to medium heat, press each M4×4 threaded insert flush into its corresponding hole in the chassis plate. Alternatively, heat with a lighter and press carefully. Allow to cool fully before proceeding.

Turn the chassis plate upside down. Drive 4× M4 screws through the underside mounting points.

Flip the chassis back upright. Loosely attach both side walls and the battery splitter using M3 and M4 screws.

Screw the battery stopper onto the battery bay using M3 screws. Then drop M4 lock nuts into the pockets at both front and rear suspension mounting locations — press fully flush.

Position and screw the two bottom gearbox halves onto the chassis at each axle station using M4 screws.

Press a 5×10×4 bearing into each axle support bracket, then screw the brackets onto the gearbox housings at both ends.

Slide the small and large gearbox internals into their housings with the axle assemblies. Apply grease to the gear faces and axle journals for smooth operation.

Place the top gearbox covers over the internals and secure with M4 screws — 4 per gearbox, 8 total.

Screw the 2 suspension mounter brackets onto the chassis (4× M4 screws).

Screw the 2 steering posts onto the chassis (2× M4 screws)(2× M3 screws).

Follow this sequence exactly: (1) slide the motor support into the chassis rail slot, (2) attach the motor mount plate with 2 M3 screws, (3) install the 21T pinion gear on the motor shaft, (4) screw the assembly to the frame with M4 screws through M4 nuts, then slide to mesh the pinion cleanly with the 64T spur gear — no slop, no binding.

Insert M4 lock nuts into the rear pivot pockets, then screw on the rear lower suspension arms. Arms should pivot freely with no excessive play.

Press one 10×15×4 bearing and one 5×10×4 bearing into their respective bores in each rear wheel hub. Thread the axle through the hub before screwing the top cap down — the axle cannot be inserted afterwards.

Insert M4 lock nuts into the front pivot pockets, then screw on the front lower suspension arms using M4 screws.

Same procedure as rear: press bearings into the front wheel hubs, route the axle through before fastening the top cap, then screw hubs onto the knuckles using M4 screws.

Screw one steering arm to each front wheel hub knuckle using M3 screws.

Screw on the main steering arms using M3 screws at post pivots and M4 screws at chassis pivots. Tighten M4 screws to the point where the arm pivots smoothly but without slop — not too tight, not too loose.

Screw on the two steering balance/bellcrank arms using M3 screws at inner pivots and M4 screws at outer pivots.

Remove the right side wall to gain access. Slide the servo into the chassis pocket and fasten down. Connect the servo horn to the steering balance arm using M3 screws. Reinstall the side wall.

Screw the frame strengthener brace onto the chassis using M3 screws. Screw the 12 mm × 8 mm hex wheel mounts onto each of the four axle stubs, then mount the tires. Install the 170 mm central driveshaft between both gearboxes.

Screw bumper using 2 M4 screws

Screw spoiler using 2 M4 screws

Connect the brushless motor to the 120A+ ESC per the ESC manufacturer's instructions. Connect the receiver to the ESC (throttle channel) and servo (steering channel). Mount the receiver in a protected location. Install the LiPo battery and secure with the retaining strap.