Hi,
I have seen veenaworld and understood the navigations to know the modules. Whether you choose Flight API,Group Tour & tailormade or group and tailor-made, the effort to make back end remains same.
I must know what are the features you wish to see in the back office with user previleges. We made travel booking with EAN APIs before so we have skills and working experience to make it.
Need to discuss price and timeline.
Regards,
Mit-