If I may chime in here, the DE-10 looks to be a modified Dance cap and ball revolver. It seems too light to be a Colt Dragoon and is obviously not a navy because it has the round barrel versus the octogon and not the army because of the modified loading lever at the bottom.
the only thing that leads me to believe more in the dragoon is the blast shield behind the cylinder and cap nipples being present on the DE-10
Outside of getting my cowboy geekness out, I believe there are some kids toys that mimick the Colt Navy. Cap guns, squirt guns, that sort of thing. I wouldn't recommend using an actual replica of any of these guns because of their price.
Dragoons are very expensive in the $400 range at the top with the brass-framed navy and army at the bottom for $150.
Now saying that, I'm actually building DE-10s as well, and using brass-framed navy's to do it. I like the navy more than the army, I'm just a fan of the octogon barrel, so it's just going to look more flashy than the original DE-10. I'm using the basics of the navy but then taking out the cylinder and replacing it with a completely fake wood one and covering up the channel for the hammer, making the gun completely un-fireable.
The DE-10 is also my favorite SW gun because it is so Steampunk Wild West and just would look amazing with beskar'gam. Hence why I actually enjoy the brass frame for this option for my kit, that and these obviously won't be fired nearly as often as my prized Colt Armies I use every month in CAS, so the brass for a prop isn't an issue and I still like that when I carry these, like good airsoft, they feel real.
Let me know how it turns out
I'll be posting up my prop pistols soon, hopefully by the end of February.
Let me know if there's anything you need, and we can collaborate on this awesome pistol