Have acquired a campervan, a Renault Master T35 LWB (with plenty room in the back for the bike

Was thinking along the lines of a baton on the side of the garage with some kind of tarpaulin cover construction. Or a large sturdy gazebo-type number with a correx roof.
Does anyone have any kind of experience of building such like or any recommendations?
Cheers.
Apologies if I have posted in wrong place Big Kneed Al (master of the emergency stop & "stand up" comedian).