Re: RG7 and 2027 neck profiles
From my recollection, having owned both guitars in question, is that the 2027 neck, while the same depth from front to back, had softer sides. That is from its deepest point, being the center of the radius, it had a noticable taper up to the edge of the fretboard. the sides were not as steep as the 7620 neck, which was, as Drew said, more D shaped. The 7620 neck definitely had more wood on the sides compared to the 2027. More meat on that bone, as it were.
I liked both of them really, 2027 was more shredder friendly while the added mass of the 7620 was more comfortable for my meat hooks.
If you are having something built, remember that it is always easier to take wood off then add it back on!!