Costs of setting up a new multivendor marketplace

I have a great idea for a new multi vendor marketplace with 3 partners ready to commit approx $40,000 in total. Is this likely to be enough to get the marketplace as an MVP to a point where external funding can be sourced or not? I’m particularly concerned about the cost of marketing.
Also in terms of time, together we can commit approx 40 to 50 hours a week on the project. Is this likely to be enough initially, assuming we outsource the marketing?
Would anyone who has used CS-Cart to set up a multi vendor marketplace be able to share their experiences?

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After few questions, our managers will provide you with the approximate costs and timeframes