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A not unsurprising response - they are shit scared their ass may end up in a sling if something goes wrong.
I had a similar response from Theoben UK when I asked about a trigger mod. Ha, they...

Ah, typical Liverpudlian....

Photos don't really give away anything to worry about though.
Where did you source the Acetal plastic?

All the other photos were interesting though :-)

Mmmm may not be a vg suggestion but wot about a panel beater ie plastic welding? They're able to do some pretty clever repairs now.