Hi @hishmad,
I struggle a bit to understand the problem statement of your proposal.
I undesrtand that is a biot like a pawn shop where you propose your NFT iin exchange of some liquidity. Is this summary correct?
If that is the case, you would need a serious expert in the NFTS to be able to provide a valuation to an NFT assets. Maybe it culd be an idea to ask to @Arthemort and the The Sandbox DAO NFT Collection Management proposal to manage that valuation.