I started this mod a while ago, but got tied up with other things before I could finish it.
I am currently trying to fit the Mini Revo VXL brushless motor as well.
I can mount a mamba on there but with the extra weight I felt I just had to make it mount the VXL motor.
All that is left to do is mod the rear upper chassis brace to be a little longer. See the secound pic.
Then the VXL motor will fit in the Mini LST.
Here are some pics below.