Simple but funcitonal tambour rail guides - both fixed and floating. You can chop and hack these as well as flip them multiple ways for your purpose. Can be fixed easily with 3mn tape and a couple of screws - seem to be holding upo well so far!
Indeed! I hacked this together for my mums van which was build DIY and a little... 'odd' and required some flexibility in the attachment. Probably slicker ways to execute!