Wow, this G-project is not for the faint hearted, but you've started pretty good on the body work. Never seen so much rust on the rear cargo area. The frame and rails you see on the rear fenders, is for mounting troop / jump seats, which kind of made the G a 9 seater. If you got a number of holes in...
Hazard, light and blower switch here, but these can be obtained from parted out ex-army vehicels as well: https://www.ilcats.ru/mercedes/?function=getParts&class=2&catalog=349&aggtype=FG&model=460212&group=54&subgroup=590&language=en Front fog light switch is A0018202510 ...
My first option would be to look into the om662 as Johnny Christensen points out on page 1 of this topic. Use the om602 engine in your current G as donor for correct oil pan, oil pick up, engine mounts and other parts needed for this conversion. Look out for SsangYong donors and keep some budget for...
Holy cow, you got your work sorted, plenty of rust to look after. If you google on 'polizei 280GE' you will find more pics of these apple green 280GE's like they used in Germany early '80-ties, like these for example: unnamed.jpg Mercedes-G-der-Polizei-729x486-cd48132213bd42f8.jpg Looks like you got...