50 cal anti-aircraft sight

I’m looking to build/beg/borrow/or steal a 1/35 anti-aircraft sight for a 50 cal mount on a Lynx Command and Control vehicle. I have gone blind looking at the forums and wonder if anyone out there has any ideas that wont cost me an arm and a leg. Thanks.

ICIT

Look at the suppliers for 1/32 aircraft sights for the targeting rings. You can fabricate the rest.