yes they are custom, and based on the same color pallet as the tree trunks, (pulled from the tf2 pallet)
keep in mind, that i can not add many brushes to this map, as it is just about maxed on the planes (87.8% full)
It is maxed on displacements, i think i have 3 left (yes the tree trunks are 12 displacements each displacements)
and overly complex (hence the signs)
but for the plank textures:
were you thinking something allong this line?
(The original style is in the middle)
oh, and for a little scale, the pic on the far right is all (i think) of the railings in the map, with everything else removed, (railings are placed on overhangs which will cause serious harm to the person foolish enough to jump over them)