All of the original TMRC designs are near perfect scale, except for any errors such as those SZD16 points out which are due only to following factory three views, blueprints, or other documentation that has been published in error.
For example, the book Sailplanes by Schweizer
by Simons and Schweizer points out in the text that the 1-26E airframe was all aluminum except only for the movable surfaces. The drawing by Martin Simons shows the fixed horizontal stabilizer as fabric covered too however. Which is correct? Both authors are experts in the field and their own book has contradictions.... plus a misprint in that it begins this paragraph with "the 1-23" which was clearly meant to be the 1-26 since that is the subject of the paragraph.
I've drawn all of our E model 1-26s with sheeted stab to simulate a sheet-metal-skinned structure, this is however incorrect. Visit Jim Phoenix's web pages here http://www.jimphoenix.com/jimphoenix...empennage.html
and you will see serial number 686's empenage, an E model with it's riveted aluminum framework with fabric covering, just as Martin has drawn it.