Gotcha. Glad I asked. Your hit point totals didn't include the numbers for Improved Toughness even though you had it listed in the equation.
Mech Guard should have 62 hp (8d10+18=62). You forgot to add the 8. Same with Mech Gunner, which should have 72 hp not 64 (8d10+28=72). Mech Hunter should have 78 hp (9d10+29 = 78). Also, Mech Scouter should have 68 hit points not 59.
Debby