Here is some excellent examples that will work perfectly for a Timor.
This one is set up ideal.
Notice that ordinary house windows were used, they are already framed so all you have to do is mount and caulk them.
The bottom half is lined with the same plastic sheets used to make shower walls, it's sold at any home building supply store.
Notice the use of 2x4 lumber rather than the 4x6 frame I used. This is much lighter and will work just fine at 1/3 the cost.
The only thing I would do differently is I would pack insulation in the empty spots and put outside walls on it. Like this..
Now here is another that would work well, it's just a tad more modest..
I need to point out that you must seal the wood with a good quality acrylic wood sealer, I used Dutch Boy latex floor sealer on mine. If you don't seal the wood, it will rot quickly from the high humidity.