At the creditor's meeting there were a few folks that asked this very question with regard to those that have fully paid for the item they are still awaiting (I myself had fully paid for a lycoming engine and have not received it). The bankruptcy court treats all contracts as "deposits", so even if you have paid in full for any kit or engine or propeller etc, it is still a "deposit" and subject to the bankruptcy process and claim process. If you gave money to Vans, and they have not sent the item to you, it is a "deposit" and you will still need to decide to accept the new contract terms (whatever they may be) or refuse and file a claim to hope to get at least some of your money back.
They also stated that whatever the courts decide is the percent that claims are to receive, it will be evenly applied to all claimants regardless of how much of the deposit you paid. they have to treat all equally. Someone had asked the question since they paid in full, would they get first dibs at getting money returned, and the response was no, all would be treated equally.