This view would usually be hidden underneath the pipes as they would normally sit on the player.
Two things of note here. Firstly the use of “cups” to join the brass U bend to the wooden drone tubes. This ensures there in no “metal inside wood” joint present, such joints can be prone to long term instability. The second is the brass clamp, one of two which are specifically made to hold the whole bass drone main section together.
A final thing to note is the brass machine screw, which is one of the very few parts I do not make!