I would make sure you line the bottom of the cagewith something, as the wood will absorb the urine and it's not fun todeal with.
My husband and I made a wood cage last summer. We really "invented" ourway through it, using my oldest rabbit's old cage, wood, and hinges.The inside liner is actually two storage units, that we cute down andglued together with some special adhevsive (it is perfectly safe forthe rabbits, the adhesive isn't where they can get to, plus we aired itout for a full week before using the cage just in case).
Here are some pictures of it. As far as wood goes, we used a fewdifferent kinds, regular plywood for the sides, spruce and pine for theframework. We're lucky and they don't chew on any of it, other than acouple test nibbles at first.