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kia ora from new zealand! i have a free-standing 4' x 8' layout in n-gauge and i used plywood exclusively for the frame/benchwork. it is 16mm thick and cut it into 90mm (4 inch) strips. lengthways, it does not / will not 'sag' as ordinary lumber does, nor will it twist or warp, and is stronger. if u are covering this framework with a solid top then L-girder type is not necessary....just I-girder. i screwed/glued all my joints, and the centre 'lateral' joist piece is double thickness because the bracing for my legs is secured to them. good luck and enjoy !
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