Sounds like a myriad of potential issues, as mentioned above. If you book through an OTA, first of all they will charge their own fee. Then you charge yours. Then, as was mentioned, what about the issue of changes? What a nightmare trying to go through an OTA to make changes.

If you pursue this, you need a partnership with a TA that has access to a GDS. Otherwise it will be way too much effort for the reward.