I found this Mechwarrior in my attic that has been there for many years.

Ah.... thats the wiz kids version.... you should totally repaint the thing!!! I think they're still in ori colors rite? I got mine all grey with some light earth spraying on the feet.

all I can say is at least it came pre-primed. haha

Yeah. Those 'pre-primed' plastically looking version produced commercially.( but still very expensive if I can recalled) I think mine was at least 10 years ago? and was bought during the last Asian finanical crisis.

I prefer winter white and did spray some white paint also
thinking of tipping the missile warhead red. Any suggestions to add in?

Now thinking of creating a science-fic setting with some tanks at the backgorund as well (all winter white too)

U should totally put in the time and effort given the rarity and price for these kits. go all the way bro. diorama, tanks, the works bro!! I support!!

Tipping the missiles is a start, but I wouldn't suggest red as it is too common, I tipped mine red too and kinda regretted it cos wasn't outstanding enough. maybe you can use something consistent with the winter camo like blue or green or grey?

step by step bro!! that's the way.