It could work. Conventional loans will be credit based. The loan officer you are building a relationship will love you if he can write multiple loans. More commission for them :)
Some conventional lenders will have a max amount of loans you can get in a year. Even though you can save money compared to the fees of a hard money lender, conventional lending can take longer and present road blocks. In addition, make sure you get a non owner occupied loan if you go that route. Unless you fully intend to live in the property.
Conventional is heavily regulated and can cause road blocks for what you are trying to do.
Here are some difference between the 2. (from trustdeed capitol bog, no affiliation)
Conventional Lenders
Banks, credit unions and other traditional sources of real estate investment capital are highly regulated by state and Federal laws, closely monitored by both their shareholders and executive boards and almost completely unable to fund a deal that is, in any way, unusual. While conventional lenders are ideal for the average homebuyer who will purchase a single-family home with a down payment and a conventional payment schedule, they are singularly unable to deal with multi-unit properties, development deals or other complicated investment opportunities.
Hard Money Lenders
Private, hard money lenders are a completely different animal. They are typically seasoned business people, often with a specific real estate background, who understand the need for reliability, versatility and speed. More importantly, hard money lenders do not answer to anyone but themselves when a decision needs to be made. Of course, their real estate deals are covered by the same safeguards as conventional real estate loans but, in terms of unusual investment deals, hard money lenders are infinitely more flexible than standard lending institutions.