Don't do the alignment with an empty van.
Do it after you get it built out and loaded to go. That will make a difference in the alignment settings.
After the alignment would be a good time to replace your tires (or just before).
Speedometer?
Is it electronic or mechanical?
Door latches might be found at a salvage yard or maybe rockauto.com
Solar is all 12v typically.
So all that will be the same.
The part that WILL need to be 220v will be an inverter (change 12v to 220v).