Hey Garrett,
Does this partner of yours have capital to bring into the project?
Have you considered taking on smaller projects to have some leftover liquidity after the down payment?
Hard money sounds like a good option for you as these loans include funds for rehab. LTVs will range anywhere from 75-90% of purchase + 100% of rehab, held back to be released as the work is completed. These reimbursements can happen frequently throughout the life of the project, but that does mean labor and material will need to be fronted in phases (hence the first capital/liquidity question). Another thing to consider is the holding costs (monthly payments) for the loan; hard money comes at a higher interest rate so you want to have a clear path on the rehab timeline and exit strategy. On top of this I recommend borrowers go into a project with some additional 'rainy day' liquidity. You never know when an unexpected cost will come up, or if the market shifts and you have to pay extension fees on the loan. It's always better to be over prepared then under.
Good luck!