I did a little research.
If we want to use chain - we need 2 x 3,5 m per board + 4 x carbines
Chain: 1m = 2 Euros | 4 x carbines = 3,50 | Total: 17,50 per board (Bauhaus Hasenheide, when ordered online cheaper.)
Chain is nice on a functional level. It makes us very flexible. But I am not so sure about the aesthetics. Rope could be an alternative.
Or tightrope (Drahtseil) could be an alternative. But it will be equally - or more expensive - and make us less flexible. Although aesthetically more pleasing probably. I can think of a solution that makes us still flexible. But would be more expensive.
14m of 2mm thightrope = 11,20 + 2 x Seilklemmen 3,10 = 14,20 per board
if we go for security and use 4 x Seilklemmen it will be 17,30 per board
Seats - Styropor
@Shu posted some concerns about the seating idea on Facebook. Maybe he will share it here as well.
If we would go for it it would give us more then 25 little benches. I found 3 options to cover it up.
Option A: Multi-functinonal blankets
(Bauhaus Hasenheide) = 3,45 per piece. (one piece per bench 25 x 3,45 = close to 86,25 Euro) | aesthetically not so nice.
Price per bench: 3,45
Option B: Malerabdeckpappe
(Bauhaus Hasenheide) - 20x1m = 9,95. - I guess we would need around 5m per bench. 2,50 Euro per bench. | Aesthetically good. Might not be stable enough. I have some leftovers from another project. Will bring it around on tuesday to test before we make the call.
Price per bench: 2,50 Euro
Option C: Packpapier
There are two options. This one 150cm. http://www.modulor.de/packpapier-grossrollen-braun.html = 59 Euro (We can get this probably cheaper online). This would cover all benches I think. There is something in the entrance area. Will bring a sample to test.
Price per bench (with 25 benches): 3 Euro
And here is the second option. 100cm x 10m.
In the cheaper version:
price per bench: 1,75
I think Option C is the best.