MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
For the heated beds the only thing that matters for configuration is the total size and the screwhole distance.
I have no experience with PLA parts but I think they will work fine for at least some time (could be tricky with the printhead parts). But why are you limited to PLA? In my experience PETG only needs a little higher bed temperature than PLA to print reliably.