I figured that I could continue on some work and not have to go outside again today; scarf joints!
It was time to get the spars to their proper lengths. This entailed cutting down the inboard end a bit to clean things up and adding a short extension onto the outboard ends of main spar top cap and both caps of the rear spar.
The top cap of the front spar needs to be 151-1/2" long. The longest board that I had to work with when I made the spar cap was something like 148" long. So yeah, a scarf joint just to get the last few inches. It was a similar situation for the rear spar. The top cap needed to be 144-1/2" long and all I had to use for that piece was a 12' long board. 12' = 144". So yeah, short by 1/2". Anyway, a little bit of work with a hand plane and the pieces fit up nicely.