I've bought MGT a week ago, and saturday we play with its rules for the first time (still in our old Reformation Coalition campaign).
As far as I have seen, conversion of hit points should be no problem at all. I guess I try a one-to-one system, meaning: One TNE damage point equals one damage point in MGT. This will definitely raise the danger level of a fire-fight in my campaign

.
And for those of us who are not so gear-heady - there's still the possibility to change the TNE-laser rifle to a MGT-laser rifle...