DarkManX,
Have you already made some before? Are pictures available? What is the approximate minimum price of a simple case where you take the standard Antec economy mid-size tower (very adaptable frame, removable sides) and simply mount its metal skeleton inside of a wooden case.
ASIDE: I'd find a "quiet dual-inline blower box" more intriguing. This would be a wooden box made to hold two-inline fans (to help develop air pressure). This box would be remotely located (to sit atop the tower case). None of the fans would be directly viewable from the exterior due to sound-deadening baffles. The out-take port of the box would have a wooden clamp fitting (as simple as a wooden square with a hold cut in it) that would be clamped to the main body of the box via wingnuts. The clamp would be used to hold an air duct (same as clothes dryer hose) hose that would go down to the case. The duct is removable from the case because there would be another wooden clamping ring to hold the duct onto the case. This archaic style would be in keeping with the case design.