Step 11: Start Gluing!
IMPORTANT: Be sure to keep track of the numbers on all of the shapes, I found it was easiest to just use multiple cutting mats and keep the shapes in place until I needed them. During the assembly steps (coming up) 123DMake will highlight where the shape you need is on its page, this makes finding the right piece easy if you kept it in its place on the sheet!
Once you have all of your shapes cut, open the file you saved in 123D Make and click "Assembly Steps". At the bottom of the screen you can click the left and right arrows to step through each piece in the assembly process.
If you kept the green squares in your SVG files from step 8 (the slow way), then you can use those holes as guides for assembling the pieces. As you can see in the pictures attached to this instructable, you can use needles (careful not to prick yourself!) as guides to line up the holes while gluing layers. This will result in a more accurate 3D model but it is very time consuming. I abandoned this method about a quarter of the way through and just lined up the pieces by eye after that. For my purposes this method was fine.
I would suggest using a glue that is somewhat quick drying but slow enough at drying such that you can slide the layers around for a couple of minutes in case you need to adjust positioning.
Now all you need is some time and patience. The time it will take to glue all of the pieces together will depend on how big you made your model. Note that some of the cutouts may be so tiny that you can just skip gluing them.