Hi on the burrito if I remember correctly you need to build the fuse sections before the H-stab and rudder. You need long sticks for the fuse and the cutoffs in the tail feathers.

When you start the wing pay careful attention to the center section parts assembly dry fit the W1 ribs and the spacer blocks. then make sure the CF tube and engine mount will slip through. Most need to add a 1/32nd piece of balsa spacer between the ribs for clearance.

And If you havent seen this thread on building the burrito check it out. [link=http://www.rcuniverse.com/forum/m_1170617/anchors_1170617/mpage_1/key_burrito/anchor/tm.htm#1170617]click me[/link]