Looking good there. I think you will find that you need a bit more weight in there for LiPo (car seems to need to be at NiMh weight to work ... not supprising as it was designed around the weight distribution with 4200NiMh cells).
I know most people have added around 180g to the car when running LiPo!
I use the same speedo you have there but rotated 90deg. Keep a close eye on the car Lucar style connectors, might well be ok but if not might cause an expensive ESC failure. You seem like a sensible chap (certainly can machine well, good work there!) so I hope I'm not sounding too insulting stating that about the connectors.
2 other little tips
1) put M3x3 (or x5) grub screws in the unused camber link holes on the hubs, just helps reduce flex in the hub and thus helps prevent the used hole going oval and failing.
2) Make up some form of stand-off for the ball stud connected to the servo horn to get the link between the horn and the bellcranks as straight as possible. This really helps the car feel balanced as you move through the range of lock left and right. The car was designed around low profile servos (I think it gives a guide stand off size in the manual but can't remember exactly)
Hope you have lots of fun with the car, just ask if you need help with set-up etc. I'm more than happy to help, especially as the base set-up I gave you was a bit of an estimate.
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