Edit: Please check out my newest version if you're interested in modding your transmitter
I've been using a GT2B transmitter for my electric longboard, it's a great radio. But in it's original form it's pretty bulky and not very pocket-friendly while you're not using it.
This case minimizes it and leaves you with just the throttle trigger as the only input channel.
To assemble you'll need;
1 x ~250 mah thin lipo cell (to replace original bulky battery)
2 x 680 ohm resistors (solder where on the inputs to the unused channel)
1 x ON/OFF Switch of your choosing (remember to create a hole in the case for that will fit your switch)
1 x M3 14mm screw (to hold trigger)
1 x M3 4mm screw (PCB)
4 x M3 8mm screws (case halves)
2 x M3 nuts (on the trigger screw between the pcb)
Some tips while modding your transmitter;