Reviewed the available options for VOR antenna that fits inside the top VS rib. Determined that the Rami 532 not the best fit (puck does not fit well in the rib and the attachment holes don't line up with the rib or support plate) and looking at other Rami options. The 520 model has screw in elements rather than fixed - trying to determine how to avoid cutting a "notch" on the top of the VS skin and the top rib to make antenna fit as the build plans describe. Working with Rami for information on the 520 and estimating exit points of the antenna elements - hopefully between rivet holes - waiting on Rami response for more detailed specs.
On the inside of the VS skin there are surface burrs that hole deburring tool does not remove. Used 3M Scotch Brite A-VFN discs with right angle drill to quickly buff this rough edge off each hole. Much faster and focused approach after experimentation than trying to use a scotch brite hand pad. The discs were the very fine coarseness (
https://www.amazon.com/gp/product/B00HSCMZ2O/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1).