I picked up this Monogram Voodoo('85 copyright) for 10 bucks yesterday.Has any one built this kit and can they advise me on how well it goes together?Plus are they any aftermarket update sets for it? 
Good score philo. I’ve got one of these in the stash too that I need to get too someday soon… I know Quickboost makes a set of replacement scoops that you can see here:
http://www.arcair.com/Rev3/2301-2400/rev2331-QuickBoost48235/00.shtm
I don’t have this set yet but I’ll pick it up soon for my build. I believe that SAC makes a set of white metal landing gear which would probably be good to have as well for this kit.
Here’s a good review of the kit:
http://modelingmadness.com/reviews/korean/us/levin101b.htm
I do have a set of Eagle Strike decals to model this NY ANG Voodoo which is my plan:

-Derek
I built the RF-101B issue of the kit many many years ago. From what I remember it went together well. Typical Monogram of that era.
Eduard makes a PE set
http://www.greatmodels.com/~smartcart/cgi/display.cgi?item_num=EDU48394
and Legends makes an avionics bay
http://www.greatmodels.com/~smartcart/cgi/display.cgi?item_num=LF4032
There are a few decal sets out there as well.
is that the 48 scale one? i tried building one years ago, drove me insane lol
there is a vodoo across the street from me. PM me if you want me to get you any pics.