It's been awhile since I've seen the actual Thundercats episode that Safari Joe appeared on, but I seem to remember that he was hunting them to display in his menagerie. I could be wrong here, but the way I remember it Joe was exposed for being a coward when he was forced to fight Lion - O with his bare hands. Due to my affinity for all characters that are Australian (probably due to my Mad Max/Road Warrior obsession as a youth) in origin, I decided to tip the scales back in Joe's favor by making him tiny in stature in comparison to the 'Cats, thereby explaining away any so called cowardice in his behavior. This change in scale is represented here by the difference in size between him and Pumyra, but the same principle applies with your vintage Thundercat figures. I guess this doesn't really excuse him from being a dirty trophy hunter at heart, but hey, nobody's perfect! Safari Joe is like an evil space Crocodile Hunter before there ever was a Crocodile Hunter!
Base - Comic 2 pack Red Star
Head - Dr. Mindbender
Pumyra - from a figure I found in a Goodwill bin, feet from Nira figure
Shrunken Heads - McFarlane Voodoo Queen
Skulls - not sure but one of them is clearly a predator skull
Facehugger - Alien 3 whatever Winona Ryder's character was called accessory
Giant Spider - McFarlane Little Miss Muffett
Display Rack - McFarlane Texas Chainsaw Massacre girl
Base - Stan Winston She Creature
Space Critter - Lost In Space girl accessory
Space Lobster - weirdly enough I found this on the ground when I was walking around
Parrot - from Shipwreck
J.A.C.K. robot - I have no idea but Joe had a robot named Mule in the cartoon. Depending on where you are in your alternate universe this guy is either before or after Mule's tenure.
Net - from Cadillacs and Dinosaurs figure
Dinosaur - Jungle Woman accessory
Tribal Shield - McFarlane Voodoo Queen
Pool Of Blood - McFarlane Gretel
Crates - I think these are WWE accessories but they come apart - the dinosaur fits in one and the space critter fits in the other
Well, I think that about covers it! Geez!
Thanks for looking !