Whatever techniques you used look like they worked out - your eyeball does not look skewed.

Many originally hand drafted plans are not "CAD symmetric". In other words they have eye and ruler precision but not 3 or 4 decimal place computer precision. But that's OK. When we build with balsa, we rarely are working to more than 2 decimal places of precision even when working with imperial units (i.e., inches). We might typically work with 1.25" or 3.125 ~ 3.13" dimensions as an example. With that in mind, when transferring hand drafted plans to CAD, it is just important that they be symmetric about a chosen dimension. If you choose a stab panel and one is 11" and the other 12", well you can choose which one to go with but once chosen, the other will be identical. This is not a CAD issue but a design issue.

Having a good feel for the proportions of model or a specific design goes a way when it comes to re-drafting or re-designing a model in CAD. In the absence of that, a relatively safe approach is that if stab panels really differ by as much as 1", then the correct dimension is probably the mean of the two - 11.5".

Eventually the little one will no longer leak fuel so you'll only need dry AUW's

I'm familiar with them "tail-o-death" strikes, especially when they are working in resonance!

David.