Link to the Arrow website
Here.
I like what I see. They're using a simple and proven engine design based on V-2 technology, but apparently without the expensive turbopump. The 4 JATO engines for the second stage provide a launch pad abort capability, with the ability to boost the crew compartment up to a mile high from the pad. That should be far enough to get clear of the blast overpressure.
Looks like they've got a good project. Best wishes for fair winds and safe flights.