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Kelly ,
  I just went out and did some quick measuring for you .
  The platform from ground to top of the 5/4 boards is 32"
   The width from 4x4 to 4x4 is 6' even
  The height about 7'5" front 4x4 and back 4x4 around 7'2" so water would slope to rear when it rains .
The pole in front has a eye bolt so I can hang a rhinehart round ball,tennis ball or carpet roll to shoot at while it swings and it's far enough out so arrows won't hit the bag targets inside when it spins around.
  I close the doors when not in use to keep sun off the targets.
My kids and I love it and money well spent .

Thanks Keith! just needed rough figures so I can adjust from there for my specific needs of not as high off of ground because I do ll of my practicing from a chair since that is how I hunt. Also, since I'm very limited on space need it somewhat portable. The pictures of how you built it are perfect.

Kelly,
  About 2 months ago I went by Lowe's in Seaford Delaware and they had those Horse stall Matt's on sale for $29.97 and they were the 4'x6'x3/4" thick ones.
Well I didn't buy that day but called a friend about them and he went to a Lowe's in Easton Md. and got 4 for $17.97 .Well I went back to the Seaford told them the cost at the other Lowe's and got 4 for $17.00 .
   Then another friend went to the Easton Lowe's and bought 12 and uses his for a backstop and to lay on ground for his garden and green house.
  Now the one I bought when o built my backstop was $49.99 at the time and now I think they are like $60.00 so shop around and check Lowe's or Home Depot if you have one in your area .
  They are heavy to handle by yourself .
   I'm thinking of building one lower to ground that I can move as well cause I too like hunting from the ground .
  There is no need to build a cabinet like I did but I wanted to just leave my targets in a cabinet and keep out of weather .
  Those Matt's are awesome for stoping arrows and if you live in a neighborhood it's a good thing to have behind your target.

Added a new PVC slanted roof over my targets this week. 

Dennis;
Nice set up, wish I had that room.

I finally got my backstop finished. I made a frame out of 2x4s and attached the horse mat with lag bolts. Then I put another two frames on top of 4x4 skids and attached the framed matt to it.

I have been shooting at my 3D target and the backstop is just what's needed. No more lost arrows for sure, unless I let one loose over the top of the backstop.