parented spaceship - Gmod crash when trying to fly

[VitasLoWang]

Hello, so I made this really simple ship from 3 medbridge props. Gyropod and pod controller are in the mid prop, seat is in the cockpit prop. It works nicely UNTIL I parent it. I use auto parent to parent everything to the middle prop. When I get to seat and turn on gyropod the ship does not move and keys or mouse does nothing. When I get out or turn of gyropod the screen gets black and Garry's Mod crashes! WTH? Is there something fundamentally wrong with what I did?
You can [URL="http://mcvitas.duckdns.org/spaceship3_1.txt"]check my dupe [/URL]and try parenting or fixing it yourself. Press 0 on numpad to turn on gyropod when sitting. Thanks in advance
EDIT: and it does not crash just that easily. It makes my computer screen black and not reacting to anything and the only way to fix it is to connect to it via remote desktop from my work laptop! LOL

[editline]8th March 2017[/editline]

I tried this with another ship and it looks like I just CANNOT have a seat parented am I right? This time Gmod did not crash but when I got out of the chair I found myself far away in space.

[editline]9th March 2017[/editline]

Seems I figured out a fix for this. I have to unweld the chair from everything. Then auto parent all props to a central one. After parenting I use multi-unparent tool on the chair to unparent it. Then I have to weld it to the central prop and it seems to work OK like this... interesting. I wonder why I haven't seen it in any tutorials.

[VitasLoWang]

and on another ship I built this does not work :(

[VitasLoWang]

So it seems I have to do the above procedure (unparent,reweld to main ship prop) with gyropod and pod controller as well!