I love this build it shows your determination to ride an electric scooter is so much you built your own,
I like the heavy duty front bearing on the plastic wheel I know most would say nasty things but they miss the point you have done well with what you was given, I'd ride it maybe not 50mph but I'd do a steady 20mph on her.
Those lipos do look puffed up be careful when charging them try do it outside in a place that if they blow they only take themself's out, myself I'd clamp a block of wood either side of a fresh pack they have served they purpose by the looks they are well used so charge slow and monitor the discharge with a volt ammeter to have a clue how stressed they are with voltage drop under load.
How do you charge ? what's the procedure and equipment you use ?