Here is how I converted mine to fit the
GW Flying Stands. (I have a spare frame or the brass rods I used before and can get you the diameter of the holes that supported the resin models before I did this if you want?)
These were made from sprue glued together with plastic cement. While they look a little rough, they would be on the underside of the aircraft.
Here they are fitted in place underneath the two Valkyries before painting. Those little white areas are where I added thin plastic card to make perfect fits with the plastic flying stand tops. They were secured to the aircraft with 5 minute epoxy for added strength and a braced against the bottom of the side door slides.
Then some paint to match them to the bottom of the fuselage and they work perfectly. I found the rod method led to tipping as it is not a solid base.
Hope that helps,
CB