1st is an original nitro RS4 which as someone who owned one isn't worth fixing as its a piece of junk(seriously it was a VERY bad design). The motor liked to strip spur gears as the torque from the motor would warp the thin chassis plate, and change the gear meshing leading to stripping. I wish I took the advice of the guy at my LHS when I got mine, and dumped it instead of fixing it as like I said it turned out to be a turd. That one you have is missing quite a few parts, and would probably cost more to get the parts then buying another. The motor was also trash in that model (I had 3 of them in other old HPI's)

2nd I dunno my guess is a 1/10th scale buggy need closer up pics, and preferably bigger

Edit Holy crap am I good figured out the buggy within a min lol can't believe typing in purple 1/0th buggy chassis in google got me a pic on the 2nd page lol

[TABLE]
[TR]
[TD]It is a HSP/Hispeed Warhead Seben,[/TD]
[TD]REDCAT Tornado,[/TD]
[TD]WINDHOBBY Sidewinder/Catamoun,[/TD]
[TD]AMAX Howitzer,[/TD]
[TD]EXCEED Xtreme,[/TD]
[TD]HIMOTO HI8103 Python[/TD]
[/TR]
[/TABLE]
Pick whatever you wanna call it as they are all the same thing sold by different companies
Here is a page that has the manual for the Touring car version which outside arms, shocktowers, and bumper looks the same http://myrc.com.au/forum/index.php?topic=59.0