Looking good so far Rate1

Its now Jig time - a sawing jig

For splicing your fuselage longerons (ie. 36" as supplied isn't long enough), I took a piece of liteply (approx 6" long by 2" wide) as a base and glued 2 lengths of 1/4" square sticks exactly 1/4" apart (use a couple of short pieces as a guide) and parallel to each other along the the length of the base (6" long !) so that you have a trough between the two. Now with your Xacto saw (or similar) and being very careful to keep the blade vertical) saw a diagonal cut across the two sticks at an angle of about 20 to 30 degrees across the middle.

Now by placing the end of one of your 1/4" square longerons in this trough, you can use the previous sawcut as a sawing guide so that when you do the same to another stick, you can then glue the two together along each's diagonal saw cut and you will have the most perfectly aligned splice joint.

Lemme know if you don't see what I mean and, hopefully, I can find out what I did with mine....dig it up and photograph it.

Note that if you have to do the same job on anything twice or more, think about making and using a jig...

Cheers