The industry standard, with 20 mm thick clear wood floor, 10 mm beading, and H4 treated bearers. Assembled and ready to go to work.
You may want to consider treating your woodware. We have available for sale copper naphthenate and paraffin wax. And of course we now have the fantastic totally chemical free wood preservatives WB1 and WB2 from Gripset. Search for "Gripset" on our website to learn more about this great product. No need to treat the bearers as they are already H4 treated to deal with contact with the ground.