Hi, the drop plane looks like an old RCM plan for a drop plane no 631-2 modelled after the pilatus porter, that goes with the chute plan no 631 designed by Konrad Riggenmann featured in issue: RCM 2-76, but they changed it to accomodate the divers side by side instead of one behind the other like in the plan. In the RCM plan they did nit use such "nasty" looking wheels
I might be wring but he RC Skydivers shown is made by a Swedeish gentelman named Nace Valjavec, his username is "nacpadelec" if I recall correctly. He actually specializes in RC Paragliders see this link to get an idea really impressive the performance he gets from his glider there are a few clips linked to his paragliders.
The second clip shows him doing drops with his skydivers off his paraglider, all by himself!![8D]