Back in the Arrowhead book, the future Arrows planned were for a Mach 3 variant. There's some concept drawings of it in the book which have a similar style air intake to the F-105. There are not many combat aircraft with this style of intake, the ramp style is much more prevalent so when I started this I had considered F-14 or F-15 intakes. But after searching for info and pics of any and all aircraft that were designed or actually flew at Mach 3 they all had one thing in common ---- more power was needed. The old tuner' adage for more power was " there's no substitute for more power than more cc's" so with that in mind I started to look for something with bigger engines. That's when I first looked at the Mig 25/31, not only are the intakes about the right shape, they are nearly twice as big as the F-15 ones, plus the fuselages have a lot of similarities to the Arrow, being very boxy so doesn't look out of place if a developed Arrow was designed. The bigger fuselage also makes it easier to install the more rugged u/c and the turkey feathers look about the right size for a Mach 3 Arrow. I decided to use a Mig 31 fuselage as a base though.
The base kits are about 40-60% Hobbycraft Avro Arrow and Zghen -- Zgemhu-- Oh WTF -- Chinese manufacturer Mig 31. I checked the history of 1959, and three events that affect this project took place, early in the year the Arrow first flew followed about a month later by the first F-4 Phantom flight. Then later in the year another aircraft flew for the first time which had about the same dimensions as the Arrow but also operated off an aircraft carrier, this was the NA A-5 Vigilante. This aircraft pioneered the ramp style intake system and this also happens to be the most successful system of all jet aircraft. Just about any aircraft that wanted to be king of the mountain used this system. My thinking is that the final design of the Mach 3 Arrow would have gone down this route (sorry Evan).
All I did to the wings was space them a bit further apart to butt up to the Mig fuselage spine (on the Hobbycraft kit the two wings butt up together and then a fuselage spine is glued above it to hide the joint) and then extended the outer wing panel leading edges. I decided to do it a bit Avro style, as in Vulcan, but gave it a very sharp leading edge. I have read somewhere that Avro (UK) was well aware of what Avro Canada was doing and even supplied A.C. some info on deltas and this influenced my thinking about these leading edges.
I increased the area of the tail, as in the Arrowhead book it shows the Mach 3 Arrow to have a much taller tail, I decided not to make it as tall and after drawing out the Mig 31 tail and working out the area of it (times two) I found to duplicate the total area all I had to do was add one scale foot to the leading edge and two scale feet to the tail base of the original Arrow tail. It then comes close to the area in the Arrowhead drawing.
Back to the Arrowhead book, it says the Mach 3 Arrow would have had to have a bigger radar so I've tried to retain the Arrow look but with a bigger nose cone, I filled the Mig 31 nose cone full of Milliput and lead (I'm thinking this could be quite a tail sitter) and then re-profiled it so it looked like a refined Arrow nose cone.