I have a
toy grade rc crawler from amazon which I bought for some 700rs 1 year back.
It was not proportional steering or throttle and it came with 4.8v battery pack. Very less run time.
Added a cheap brushed ESC (from BG) and servo(towerpro standard) to make both steering and throttle proportional. Also replaced battery pack with 2s (DIY 2 x 3.7 Li-ion (from old tablet)).
It is much fun to drive now.
Included FPV gear and its perfect indoor crawler!
Note: In real video is better. Its bad in recording as its done using eachine rotg01 VRX and go fpv app. Planning to buy eachine DVR and add it to goggles.