To be honest, a full fighter line for the Bundschuh is perhaps more than they could inRP handle and maintain. For now I suggest you start with a VHF, which takes part of both the hessian and the Rheinland military line, because the hessians have a shipyard that could help the Bundies to assemble a fighter, while the military parts come from defecting Rheinwehr soldiers.
For the models:
The SHF just looks like a Mjolnir to me, which the Bundies already have 75% access to. Unnecessary IMO, but you arleady said that you want to remodel it.
The rest of the models lack the Rheinland look to my mind.
