It is their own mould. I have two of WW Flankers, and the screw holes are not visible on them, neither are they just plugged with a piece of plastic. Plus, the panel lines AND rivets are way more pronounced than on WW, and the bottom part of fuselage has different size and shape than on WW. As to seeing HM Flanker, I wrote to William like two days ago, and they are considering it, but it needs more thought because of, as William puts it "rather limited market".
I still believe that we might see HM Flanker, because, lets be honest, while I appreciate AF1 for trying, their models arent that great. Screwholes, ridiculous riveting that looks like a WW2 battleship, only wheels down, and more than often colors that are way off compared to the real thing arent that much of a threat.
Screw holes, engine covers not positioned straight, wing tip rails not poisitioned well, more rivets then a battleship, why does this Chinese manufacturer think to make a realise model, you add rivets to everything They should me making model battleships or stream engines rather then aircraft
As for these type of models being limited.... Bull*****
haha. You'll find that the panel lines you don't seem to have a problem with are virtually smooth on the real thing - among many other things. Seriously, if you measure the width of the panel lines on, say HM's Viper model and then scale that up from 1:72 to 1:1, you'd end up with a panel gap the size of your hand. I hear you on the rivets, and I agree, they look wrong, but it IS a very subjective thing and they're no more 'wrong' than your panel lines.
Good moulding in diecast appears to be about knowing where to be dead-on accurate (eg - silhouette, wing shape, proportions etc) and where to approximate due to physical inability to completely replicate the real thing. This is the part where it gets completely stylistic and subjective - eg. "how many of those landing gear assembly struts do I really need and at what point does making them accurate virtually guarantee they'll snap off within three minutes of installing them? When have we got 'enough' detail in there to satisfy the majority of collectors and look generally 'right'"?