Volitar Prime wrote:
The "core" of your 3x3x5 is just a 3x3x3 with two extra layers added to it. You can treat this "core" 3x3x3 just like any other 3x3x3 and solve it the same way. This will restore the shape and leave you with only the two added outside layers to solve.
Aaah. Thankyou Volitar. An aha moment for me. I was thinking that you had to restore it to a cuboid shape with any pieces anywhere, but I see now that each piece has exactly its correct position. I hadn't seen that before.
It's now solved.