Styrene would be easy

Sheet styrene of the needed size with structural shapes, angle or t-section for the stiffeners would work, and now with the availability of rivet decals, a very nice looking model could be made.

Material

Styrene is a very good material because it is smooth, comes in very thin sections, and is available in very small dimension strips or easy to cut in small dimension strips.  Wood has a grain which will be visible on flat surfaces, about the thinnest section is 1/32 or maybe 1/64th in which is 1.5-3 in thick in HO., and cuting narrow peices can be a challenge.  An alternative material harks back to the dawn of time (the 1960's and 1970's) and that is Strathmore board.  It is a high end art paper, it comes in a variety of "plies" or thicknesses.  One side is very smooth and the other has a bit of texture,  It can be cut very accurately.  

I would go with styrene, waaaaaaay easier.

Just went with the laser

Just went with the laser method and some thin ply, will put the textured side on the non visible side it looks petty good even when not painted