I heard Birch is strong and light. So is it Birch plywood? Birch partical board? Birh hardwood? I was walking around Homedepot and the selections weren't the greatest. I did see some 3/4 MDF but those suckers are heavy. I want something 1/4" that's light and stiff.

 

just use 1/4 inch particle board. its easy to work with and pretty light.

 

MDF is the typical standard of what to use, you can also get it in ultra light MDF which is also very nice.

 

yea its really easy to cut too and i got it for pretty cheap(much cheaper than the plywood come to think of it)and it was light

 

I used regular plywood. It is much lighter than MDF and particle board. Held up well too after I cut it. I sealed it and it was good to go. Now I am in the process of making an "under-box" that will fit in the wheel well.