Lay the 1/4" plywood panel down on 1x2s and set circular saw blade to depth just past the thickness of the material.

Cut 33-1/2" x 48" pieces.  Then measure and mark, and cut the 32" x 48" piece.  Then measure and mark and cut the 28" x 48" pieces.

Then cut the 28" x 48" piece down into four ~12 wide panels to make up the roof pieces.

Repeat for the second sheet of 1/4" plywood.

NOTE: The saw blade takes up about 1/8" space, so you can't just lay all the cuts out and cut.  You have to make one cut, then measure and mark and make the next cut.  On the roof panels, if one panel ends up being a little smaller, it won't matter.

Cut the 1x2 pieces out according to the cut list, making the longest cuts first.  Save the shorter cuts (window trim pieces) for the end to use up your scraps.

First, lay out all the pieces and mark locations of pocket holes.  Drill pocket holes, only one needed per joint, on the 3/4" setting.

Then, build the blue section, attaching with 1-1/4" pocket hole screws and wood glue.

Then attach the two roof rafter pieces together, with one pocket hole at the top. 

Then attach the roof pieces to the blue section.

Place the 33-1/2" x 48" plywood panel on top of the frame, so it is flush to the bottom, but a 3/4" gap in on both sides, and gap on the top.  Attach with glue and 3/4" brad nails or staples.

Cut off the top triangular pieces to create the house shape.

Cut out the window as shown (jigsaw is recommended).

Build the window trim with a single 3/4" pocket hole and 1-1/4" pocket hole screws and attach to the plywood panel with glue and 3/4" brad nails.

Repeat the steps to build the front and back walls.

On the front and back wall panels, the 1/4" plywood will be 1/4" short on side edges. Build the back panel first.

On the front panel, the doorway may move the framing inward or outward, use the plywood to square it up, keeping that 1/4" gap on the side edges.

We recommend painting or staining at this point.  Wait to assemble in the room, as the finished product is most likely too big to fit through doorways.

To assemble, use three screws per corner.  I used 2" long self tapping trim screws.

Attach the ridge to the top, so the outside edges of the ridge are flush to the outside edges of the gable wall tops.

Add the eave 1x2s with screws.

Do not glue these boards, as you may want to disassemble at a later time.

Place the outside roof panels up first, with about a 1/2" overhang to the outsides.  Top edge is flush.  Once the two outermost roof panels are up, simply eyeball the placement of the two inner panels. I used 1-1/4" screws to attach, four per panel. 

Build the three window boxes with 1-1/4" brad nails and glue.  Stain.

Attach to the window trim with 1-1/4" brad nails or the screws, I did three nails per end, and then three on the underside.