The only option that I can see is if you take action against the person who approved the payment (Sec??) at CTTT to obtain an Adjudication ruling against them for misuse of strata funds.
Once you obtain the ruling your Strata Office Bearers Liability Insurance should cover you to revover the money from them. The Insurance firm might go after the sec to recover the funds from him, but that would not be your problem.
I cannot see the designer or SM being liable at all.