Hi,
Nice video .. but you make a 3 points take off

BTW the retract of wheels is veeery fast .. LOL
When take off .. have the plane on the main gear (as in reality) with plane horizontal (as in my pic) and check what happend with the wheels.
But the plane will not even load in FS9
I have no probs with the modified CFG and air but be sure the names are good !
The air file must be
He111Z.air and not HE111Z.air !! as in the download
the aircraft.cfg have this name
[fltsim.0]
title=He111Z Green Camouflage
sim=
He111Z
model=
panel=
sound=
texture=THZL
And you will also able to make correct landing instead those high attack angle approach
If you want use the contact points for the bimot you must use this:
[contact_points]
static_pitch = 9.3
static_cg_height = 6.8
max_number_of_points = 7
point.0 = 1, 15.8, -8.8409, -9.8, 6153.3, 1, 0.62, 0, 0.5, 2.5, 0.8, 7, 10, 2, 0, 0
point.1 = 1, 15.8, 8.8409, -9.8, 6153.3, 2, 0.62, 0, 0.5, 2.5, 0.8, 7, 10, 3, 0, 0
point.2 = 1, -23, 0, -3.45, 6153.3, 0, 0.62, 60, 0.3, 2.5, 0.7, 7.5, 8.1, 0, 0, 0
point.3 = 2, 9.00, -59.00, 2.00, 1574.80, 0, 0.00, 0.00, 0.00, 0.00, 0.00, 0, 0, 5, 0, 0
point.4 = 2, 9.00, 59.00, 2.00, 1574.80, 0, 0.00, 0.00, 0.00, 0.00, 0.00, 0, 0, 6, 0, 0
point.5 = 2, -30.00, 0.00, 0.00, 1574.80, 0, 0.00, 0.00, 0.00, 0.00, 0.00, 0, 0, 9, 0, 0
point.6 = 2, 28.00, 0.00, -5.00, 784.32, 0, 0.00, 0.00, 0.00, 0.00, 0.00, 0, 0, 4, 0, 0
gear_system_type=0