Those trucks look difficult to mount motors to, have you found motor mounts compatible with the (seemingly round) profile of those trucks?
They might be more trouble than they’re worth.
I’m anti flipsky (for ESCs) due to my own personal experience, however with enough knowledge and understanding I’ve been told they can be an excellent and cheap power system, I’m just salty about 3/4 flipsky VESCs I’ve bought lasting a collective <60 miles. I’ve had much better luck with my makerX DV4s (I bought 2)
Both are good options in my opinion, li-ion is likely to have greater cycle life and a lower lifetime cost but lipo is an excellent way to get started for low initial cost, just be sure to change your low voltage cutoffs as vesc default voltage settings are substantially too low for lipo.
I’d be concerned about strength but there are people doing similar things successfully @IDEA vesc boxes have printed walls with machined aluminum plates on the top and bottom (I assume that design hasn’t changed since I bought mine, Tom could confirm/deny that)
Likely a decent amount of soldering, if this isn’t something you’re confident/familiar with I’ve had really good luck going to a local RC shop for soldering jobs I’m not confident enough to attempt myself (of course with a generous tip included).
Other connectors are kinda up to you, I personally like MT60s for phase wires but those may be harder to solder for somebody without as much experience.
Many people use bullet connectors as well which are certainly easier to solder as there’s no plastic to melt on accident and you can space wires much further apart before soldering.
To put lipos in series you simply make a connector that connects the negative of 1 lipo to the positive of the other, then use the remaining positive and negative into a connector, if you don’t feel confident doing so you can also just buy an XT90 series connector pre made.
I’m pretty confident that MBoards batteries all come with a pre-installed LLT BMS. Lipo batteries will not come with a BMS and will require a dedicated lipo charger.
If you want to charge a lipo pack
You’ll need to buy and put the effort in to wire a BMS, this is a relatively simple job but is also relatively high risk and I wouldn’t recommend for a beginner, I was actually in the process of doing this for a set of lipos myself before my shoulder surgery.
There’s a great guide for how to do this here
I have several years of experience building esk8s and am still nervous doing this as the risk is still relatively high. I imagine any of the battery builders here would be willing to wire up a BMS harness like this for you to install yourself which would still likely come out to a good bit less cost than a fully built pack.