Barrel barge draft and trim simulation

Hi! I’m building a structure on a barrel barge for my thesis project in architecture. The “hull” is made out of 20 x ≈220L barrels. Is there a way to calculate/simulate draft and trim as I try out different layouts and placements for the structure? Orca seems very over the top to learn for this project. Is Swordfish an option?
Thanks in advance!