Bottom Bracket lug core from below prior to fairing. Marks indicate landing pad fairing zone (1cm deep circular & flush to each stay). A mark is also indicating approximate centerline of bottom bracket.
I used a high quality G-Flex epoxy (4-7 hrs set time) thickened with a high density adhesive filler...although kit comes with 5-minute JB Kwik for this work. In hindsight I would go with a faster curing epoxy next time...as I basically lost most of a day waiting for it to set. None of these bonds (except seat post sleeve) are structural at this point...all strength comes from glass & carbon work later.