Thanks for the replies.
I have some wing bolt blind nuts from a big stik ARF (hence the name) and they fit the ones for the 4*, so I think I will use them if I can figure out how to get them aligned properly. I don't have a tap to use the recommended method, so I think I will improvise. I like to change things. When I'm done, the 4* will have dual wing servos, a thicker firewall, and I hope to mount the fuel tank directly over the center of gravity, so the plane flies EXACTLY the same with a full tank, or an almost empty one. Reasons-
dual wing servos- if one fails, you have a chance of flying it in on one (I've done that with Spads)
thicker firewall- I may want to make it slightly overpowered...the one supplied was kinda thin
fuel tank position- to ensure that the center of gravity is stationary

I just want to add that I know for a fact that the plane flies wonderfully without modification, and by no means am trying to say that it needs improvement or wasn't designed well. I am one to modify, and change things and when I have too much time on my hands and not enough projects, I change stuff. I would appreciate input from anyone on what you think of these changes/ modifications. Has anyone else tried any of them?