reversing base orientation

[Michigan Joe]

This question is a general question (no particular rule set, just curious what some opinions are on this subject).

How do people feel about bases going backwards. In other words, tweaking the bases to go backwards from its original orientation and placing them on the figure such that the back of the shell is now in the front. An example is you could have O-lineman on rounded front Prolines in which the square back edge is now on the front and the rounded front is now on the rear (allowing the RB to slide off of his lead block easier). I'm guessing those who would object would be concerned about the shape of the rear in which several bases are slightly concave (cupped inwards) rather than the traditional convex shape (slight bulge beyond flat). Personally I'm a fan of any kind of frankenstein bases and such as long as they meet the leagues length/width/height/weight standards for bases.
Joe