This is not so much a question pertaining to front ensemble marimba playing, but in four mallet playing in general.

Basically I came with up a grip that fuses elements from the Burton Grip and the Traditional Grip. I know that this isn't a "formal" or "correct" grip, however I experimented with it, and I think I feel the best with it. Should I use this grip or should I just focus on one of the main grips (stevens, musser, burton, traditional..)

Basically in this grip, the position of the mallets are just how they would be in a Burton grip. When you hold the mallets however, you put both your thumb and pointer finger within the vicinity of the two sticks- it looks like the crab like "pincers" used in the traditional grip. This way, you do not have to squeeze and move your fingers to increase intervals with the Burton grip, you just slide your pointer finger to open up intervals.

In essence, it is the exact same technique used on the traditional grip, just with the configuration of the mallets in the Burton grip. You hold the sticks as you would in the Burton grip, but you change intervals in the way you would with the traditional grip.

Lol, do you think that I could get away with playing like this? Or would this "makeshift" grip be unacceptable to the masses?

I asked a similar question before and there was a poll a while back with the option of a mix and match grip. and the general consensus was do what is comfortable to you. if your grip helps you change intervals, then by all means use it. there is a new "cross grip" that mixes traditional and burton grip. no person will ever judge you because you played something beautifully with a grip that is different from other people who play four mallet. and if they do, then forget them. also, since everyones hands are different, mixing and matching can and does help a lot of people with four mallet grip and playing.
hope this helps,
whstenor

Technique is simply described as a set way of playing something efficiently. Burton and Stevens, these were just created by 2 normal guys that decided to lay out set rules on how "they" wanted to play marimba and vibes. That's why theres so many variations on play every instrument. But neither is wrong, their just different theories. Last year I adjusted the rules of traditional grip and we developed Hybrid 4-Mallet. It just has to make sense overall to be a "Good" Technique.

Pictures of it?

If you can do what you need to do with it, I don't see a problem. Even Burton and Stevens are relatively young when you think about it, especially in comparison to things like piano or violin technique which have undergone centuries of tests and changes. Sometimes it takes an innovative performer to come along and advance the instrument and its music because of a particular technique (ie. Rachmaninoff, Liszt, Paganini, Wienawski).

Look at Theodore Milkov... he uses a modified cross-grip (that no one else yet has really used), and can play Scarlatti like nobody's business:

http://www.youtube.com/watch?v=X4Xm9He1uaY