Looking for piston twin parts catalogs for design purpose.
 

Hello ! I'm student of Rzeszow Technical University from Poland. I've to design engine mount , nacelle and main gear for project of light ( below 5.7 t ) pressurized twin engine piston similar in shape to Piper Seneca. Probably in future I'll have a task of designing pressurized cabin for the same project. I've searched the web for parts catalogs but found nothing to download :( Can anybody could help me with parts catalog for Seneca II-V / Cessna 414 , 421 or any other metal light piston twin ? best regards Ericson