Before bending and gluing the lower bout ribs, the outside contours of the blocks must be scribed and trimmed based on the curves of the upper and lower bout Formica template:
Once scribed and trimmed to the line, the blocks appear as follows:
As part of trimming the blocks, the corners of the c-bout ribs are feathered:
Also, small mortises are cut into the upper and lower blocks for linings (note that some makers don’t mortise the linings into the upper and lower blocks, but I am doing so here for stability):
With the blocks prepared, the lower bout ribs are bent in the same manner as the c-bout ribs:
The joint where the two ribs join together on the bottom block must be as seamless and tight as possible. To accomplish this, I used a large plane to trim the ends of the ribs:
With the ends trimmed, one of the lower bout ribs is glued to the centerline as marked on the bottom block. It is important that the rib naturally flow in a parallel manner to the corner block to avoid gaps between the rib and the form from twisting the rib:
The other lower bout rib is then glued to the bottom block, making sure that the joint remains as tight as possible:
Once the glue has set on the bottom block, the lower bout ribs are glued to the corner blocks and clamped:
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