NOTE: Have added the Sketchup file for this design to allow it to be tailored for your choice of servo.

This is an Antweight (150gram) pusher/flipper combat robot which I've called Front Flip.
This bot was designed as the third of three bots to replace our groups aging loan bots.
It's also perfect for a first time combat robot build, designed with a lot of space inside to fit your parts with little trouble. Check out a build video here:

Parts list:
- Pololu 40x7mm wheel (pair)
- Sub-minature DPDT slide switch
- 3mm LED
- Resistor to suit 3mm LED (depends on preferred colour)
- Dual Way Bidirectional ESC 2S-3S 5A Brushed Speed Controller
- Turnigy Nano-Tech 300mAh LiPo battery (up to 300mAh will fit)
- Microgear Motors (2 of) Low Voltage (6V), 30:1 or 50:1 gear ratio
- Micro servo, the EMAX ES08MA II fits well.
- Flysky FS-i6 Transmitter with receiver (any transmitter with mixing is suitable)
- M2x10 screw
- M2x8 self tapping screws (4 of)
- M3x10 phillips head screws (4 of)
NOTE: Part links aren't provided since they typically expire after a while.
You should be able to find every part through a search engine and/or on eBay.

Assembly:
Print the body, cover and gear motor clamps (2 of).
Drill through the hinge hole of the flipper part with a 3mm drill bit.
Run two M3 screws through the front hinge holes of the body part.
Press fit the servo into the slot, feed the servo cable along the recessed wall.
Glue the servo horn inside the ServoArm part.
Pass the M2 screw through the slot in the Flipper part and screw into the end hole of the ServoArm part.
Position the Flipper part inside the body and screw in the M3 screws (from earlier) so that they go into the Flipper hinge holes.
Test the servo and set it's neutral position. Then mount the servo horn to the servo.
Cut off the female red connectors on the speed controller. Cut the red wire for the male red connect around the middle.
Solder the motors and power switch to the dual speed controller.
Using a spare female red connector from the speed controller, solder the LED and resistor to the red and black wires.
Plug the speed controller black plugs into the receiver (suggest channels 1 and 2).
Plug the soldered LED connector into the receiver (any channel is okay).
Install all parts into the printed body, secure the motors and motor clamps to the body with the M2 screws.
Plug the battery into the speed controller's male red connector.
Run a spare M3 screw into the printed body to pre-tap a thread for the cover.
Mount the cover and secure with two M3 screws.
Push the wheels onto the motor shafts and test!

Good luck!