I didn't know about this model, thanks for sharing.
Chopping back a nice hand guard like that seems kinda iffy to me.
Have you considered an MI or RS Regulate model (for ACE) and measured to see if you can modify one of them instead? I know the front end of the receiver is different, but...
What we really need is someone to order 3-4 of these hand guard models out there, and measure/compare against original and ACE dimensions, so we finally know what mods are the least involved to do. There are tons of ACE-ACE and original-original videos out there, but very few that bother to measure anything.
For example, isn't the original front HG retainer in the same spot as the ACE front HG screw ferrule? It looks like it's pinned in the exact same spot. Then all one has to figure out is how to adapt the back end of the aftermarket HGs to fit an original receiver. Might be a chop, might be an adapter block, but I don't have any in-hand to find the easiest path.