Kerfing

In order to attach the soundboard and back to the sides, the gluing surface area needs to be increased. In order to do this, a lining with a series of cuts or 'kerfs' is glued in which effectively quadruples the gluing surface area. Linings like this can be bought from luthier suppliers such as  Touchstone Tonewoods or Stewart Macdonald. However, buying these linings from a luthier supplier seemed quite expensive for what you got and so I decided to make my own.

There are various kerfing cutting jigs that can be made for use in conjunction with a bandsaw however as a result of three bandsaw blades snapping in 4 weeks I decided that I would cut my kerfing by hand.
I did this with a mitre box and a hand saw with a block clamped in place that kept the kerfing strip held firmly against the edge of the mitre box. These can be had relatively cheaply.

The cuts made in the strip should be evenly spaced (mine were about 7mm apart) and should be cut nearly al the way through the wood making it flexible enough to bend around the tight radiuses of the guitar's body.

To clamp the kerfing strips in place I used clothes pegs. These are perfect as only a small amount of clamping pressure needs to be applied and they can be bought in great quantities quite inexpensively.

A photo of the kerfing strips drying up:

Here are some close ups of the kerfing strip glued into the guitar body: