Hvmaxx is technically limted to 4s lipo, but that is a nice safe voltage to use- the esc will run on 5s lipo with no special work, it just gets abit toasty after a short period of time....
Im guessing they used 3s because a 4s lipo is abit too big to look 'proper'?
If only some of the guys around here could get their stuff featured, it would make wimpy conversions like what magazines do look totally crap by comparison.
If someone has a well done conversion I am sure if they send an email to the rc magazine with a brief write up and some pics they would at least be considered (maybe).
Essentially, you can't wait for them to come find you, take what you have to them. If they aren't interested, then that is their fault.