While there were many different body styles produced in Series Landrovers, a canvas top five door is not one of them, although I have seen one conversion, and pictures of others.
As you have probably realised, the roof abd sides behind the rear doors can be easily removed, but neither rear side doors nor the back door have removable tops. Standard hoops could be used at the back and probably at the back of the rear doors, but you would have to fabricate a hoop to join the B pillars. frames and seals for the door tops would have to be fabricated using the two door design as a guide. The back door will need to have a hinge added at the top of the lower body - a better idea may be to convert to a tailgate (pretty easy). The canvas would be a custom job, perhaps modifying a canvas for a two door.
You may find it useful to get hold of the parts and optional parts books - probably the easiest way is to get the 'Rave CD' - see 'shop' on the bar at the top of this page.
Hope this helps,
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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