After installation via the CSW loader, I tried to disable the original 3D HUD (fa-18!MFD) and replace it with the Weapon for FSX 3D HUD (CSWeapon!hud3d) in the Boeing T45C "Goshawk". The new Vcockpit01 is as follows :

[Vcockpit01]
Background_color=1,1,1
size_mm=512,512
visible=1
pixel_size=512,512
texture=$t45vc

;1 = left DDI
;2 = right DDI
;3 = center DDI

//gauge00=fa-18!MFD, 36,36,440,440, 4 NOSCANLINES   // Original F/A-18 Hud !!!
gauge00=CSWeapon!hud3d, 569.8, 523, 462, 500, 4 NOSCANLINES    // CS Weapon VC hud3d !!! width, height, hor. size, vert. size

and there is no CSW HUD3D showing in the Vc !!!! just the red circle is showing for 2 seconds before vanishing

do the new width, height, hor.size and vert.size (569.8, 523, 462, 500) must match the previous ones (36,36,440,440) ?

from a/c .cfg [Views] eyepoint=12.100, 0, 2.60
from default Weapon.xml <CollimationData>0.0,14.01,3.358,0.307</CollimationData> changed to :<CollimationData>0.0,14.01,2.600,0.307</CollimationData> to get the same Z value

"The Y (to include in the collimation along with X and Z) you can get in two ways : from the model source files or playing with aircrft.cfg eyepoint Y value (-17.0 in sample above) until the eyepoint will lie in the same plane with HUD. Then record the findings to <CollimationData> and set the aircrft.cfg eyepoint back to initial condition"

I did not play with the eyepoint Y value "until the eyepoint will lie in the same plane with HUD" because I'm not sure to understand "will lie in the same plane with HUD" ???? Should I do that to get the best possibel Y value ? I got the CSWeapon!hud3d working in the FSX default F/A 18 whitout doing that kind of manipulation...

where is  the model source file if available ?

I've got exactly the same problem with the Grumman F14D. Both a/c are Dino Cattaneo's addons for FSX