MadDriver,
Have you read over my LT-40 build thread? It might help you with getting through these spots. Your can find the thread here: [link=http://www.rcuniverse.com/forum/m_3439708/tm.htm]Pay It Forward build thread!! LT-40 build.[/link]
Here is the specific post in the thread where I dealt with this step [link]http://www.rcuniverse.com/forum/fb.asp?m=3459127[/link]
There is a warning printed out in the instruction manual that says the slots in the trailing edge are correct because the plans can shrink or expand. Read through my build to see how to deal with it.
Note: It is possible for plan paper to shrink or expand slightly with humidity changes. If it has, this is where you will notice it! You may find that the rib notches in the trailing edge do no exactly match the rib location on the plan. Nonetheless, they should be very close, not off by more than the thickness of a rib. A slight difference is nothing to worry about! The machine-cut notches in the trailing edge are correct, and you should build your wing according to them. To install a wing rib in the steps coming up, simply put the rear end of the rib in the notch, and then align the rest of the rib parallel with the rib lines on the plans. Do not alter the notches in the trailing edge!
Ken