Barrel ECal: Implement full frames for the AstroPix slots
Is your feature request related to a problem? Please describe.
AstroPix frames do not have vertical walls in the current implementation, only horizontal.
Describe the solution you'd like
Implement frames as 2 trapezoids, one make of carbon fiber, second filled with air placed inside the first one and smaller of EcalBarrel_CarbonThickness. Then the staves need to be placed inside the second air-filled trapezoid. Something like that was done by @Chao1009 in this version of the barrel_interlayers.xml: https://github.com/eic/epic/commit/e1cee1f0b2176d8a0d47c07cdac63beb74bf59bb, but then it was changed to the top and bottom part of the frame only.
Describe alternatives you've considered No alternatives
Additional context See the illustration below: