Hi Tim - depending on your weight - a hub motor (especially only one) might not work great for you. I’d likely suggest a more typical motor mount w/ belts and gears - allows gearing down for better hill performance and lower speeds.
A couple suggestions on edits:
Batteries - i’d get direct from HK if you can, but i’d also go for the 30 or 40c+ versions of the 5000mAh - less voltage sag and better performance.
VESC - looks good. I have a few from DIYes and just be moderate w/ settings sticking to BLDC not FOC for best reliability.
Remote - i’d go GT2b instead of that one. You can 3d print a smaller enclosure (Badwolf, flatline customs, master cho or okp also).
BMS - you don’t need if you use a regular charger. and for lipos - i like to pull them to charge. Inspect and make sure good to go.
Charger - i’d look at the iMAX B6ACV2 instead - has integrated power for simplicity. Most of the others you need to buy a separate power supply to power the charger. Only 5A charging is a bit slow but works well.
Again - how heavy and how steep a hill in %? 10%, 20%, ???
Sign in or wait on the page before you order - it should give you a lower price.
The thing i like about 3s cells - you can dial in power by adding more in series. I give my GF’s board to her usually with 2x3s 6s 8Ah zippy flightmax’s listed above. Good power but not too much for a beginner. Then when i ride i can add a 3rd for 9s, or 4th for 12s.
So for “cheaper” - and especially as you learn - i’d run 6 or 9s and then add a 4th for 12s when you are experienced and ready!
