Do you really have no side walls to fix a frame to. .8m of vinyl is still a good weight. Otherwise the Vitsoe system works, I'm not sure if you can hand the large shelf on tiny rails though.
There are sides actually (alcove), I was just thinking I didn't want it boxed in. The tutorials I've seen sandwich a fairly thin frame with board, I'd worry about that coping with the weight, but could potentially reinforce with metal T-section.
Do you really have no side walls to fix a frame to. .8m of vinyl is still a good weight. Otherwise the Vitsoe system works, I'm not sure if you can hand the large shelf on tiny rails though.