I've just had a brief investigation into analysis capability's, it appears that I can quickly build a structure in Solidworks or Rhino, mesh it up in Patran and then export it straight into Fluent and bypass using Gambit to apply the boundary conditions.
[note. the neutral format allows defined groups of nodes / surfaces volumes, these can then have the boundary conditions assigned in fluent]
The bonus is that it appears the results can then be fed back and passed through nastran to get stress and deflection results for say; thermal loads at a specific cooling water flow rate through a cylinder head.
This in combination with LOTUS's engine design software, and the MSC Adams vehicle analysis software, gives me the capability to design all the aspects of this and the next vehicle.