Hypersizer V5.7 will import a Nastran FEM bond panel with QUAD elements representing the  face sheets and a Solid elements for the core. A full list of Nastran elements and case control commands supported by Hypersizer is shown below:
CASE Control
  SUBCASE, SUBCOM, SUBTITLE, LOAD, TEMP, TEMP(LOAD), TEMP(BOTH), TEMP(INITIAL), INCLUDE
 Coordinates:
  CORD1C,CORD1R,CORD1S,CORD2C,CORD2R,CORD2S - Nested coordinate definitions ok
 Elements & Grids 
 GRID, ROD, CBAR, CBEAM, CQUAD4, CTRIA3, CSHEAR, CHEXA, CPENTA
 Material Properties (MATx – Hypersizer reads first column only)
 PCOMP, PSHELL, PSOLID, PROD (future), PBAR, PBARL, MAT1, MAT8, MAT9, WTMASS
 Loads
 LOAD, PLOAD2, PLOAD4, TEMP, TEMPP1, TEMPRB, TEMPD
A PPT example is available showing the bond panel solid element import process. Please contact Collier for a copy of this PPT.