Dumb question but is the 5mm plate interchangeable with say the fixed red aluminum?
All plates are exchangeable and work with the same chassis.
Since you're shipping from the UK: there won't be any import taxes within the EU (or specifically Germany), right?
Not sure at the minute.
If the parts are declared full value, then they'll be made VAT exempt as I'm reshipping (in short terms), and any custom charges will be independent to each package.
If they aren't, and they're low enough to not make a fuss, then it'll save us all money (apart from me, but I could work this into overall costs, not sure).