Build a rover base on my Mini Orlandoo-Hunter OH35A01

1.I’d like to build a very little rover on my Mini Orlandoo-Hunter OH35A01, i plan this so a long time, now it almost finish:

2.I use a HC-O6 Bluetooth module for data link, and use a T-lite rc radio, MatekH743 mini, every thing look so mini and cute, next step i will look for a little GPS module, with it i can do a auto mission outdoor, any recommendation for me?