Is My Simple Camper Van Electrical System Design Safe and Functional?

Hi everyoneI hope I am not out of line posting in this forum, but I know next to nothing at all about electrical circuits. I was hoping I could get some advice as to whether my design for the electrical system in my van is safe and makes sense. After about 4 days of research, this is what I was designed. Despite my research, I am nervous to waste a lot of money or burn my van to the ground. I hope it is legible enough to read and provides enough information.Any help or advice will be greatly appreciated. Thanks so much!

It generally looks OK but I have a couple questions and comments

Does the battery to battery charger have protection to prevent the starter battery from being discharged if the house battery is drained? I would hope that it does but best to check. If not, you may want a disconnect switch.

I don't see any battery disconnect switches (unless the battery to battery charger incorporates one). Depending on how often you use this camper van, you may want to disconnect the house battery when it's not in use.
An automatic low voltage disconnect switch between the house battery and load would be useful but not necessary if you keep an eye on the battery monitor.

You say "130 Ah alternator" near the Starter battery.  I assume that is the van's alternator?  Ah usually refers to an amount of charge stored rather than rate of charge delivered.  Should that say 130 A instead?  So the alternator keeps the starting battery charged and the B2B charger keeps the house battery charged from the alternator and starting battery?  Elizabeth's points about disconnecting the load when battery charge level gets low are good ones.  The biggest pain in battery operated systems is when batteries become over-discharged.  Not only inconvenient but often damaging to the batteries.  I assume the starter battery is lead-acid?  And the B2B is specifically for charging Li-Ion batteries?I am glad to see the use of so many fuses.  Remember, fuses should be sized, first and foremost,  to protect the wiring to the loads from overheating and catching fire.  Not so much to protect the loads.  So use the correct ampacity wires.  Search AWG in Wikipedia for a good chart that shows ampacity vs. wire size. Best, -JD