Software for optimization of structural members

Personal project
Constructing a large hovercraft from structural plywood/epoxy.
The structural members (a truss/frame mixture) will be built up as
required (solid,hollow,I beam).
Stressed skin of 1/8 inch(3mm)plywood epoxied to the interior frame
members is thought to be a good possibility (semi-monocoque).
I have Googled for software using search words like "buckling frame
optimization finite element" and have found ~ 5 softwares that might
be suitable (~ $5,000+) but is there any software that you could
recommend that is more suitable for least weight of this situation
than others.
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