Photos are from these threads:

http://www.benzworld.org/forums/r129-sl-class/1592759-renntech-sl70-what-do-i-have.html

http://nast-sonderfahrzeuge.de/forum_archiv/board_entry.php?id=13460&page=100&category=0&order=last_answer&descasc=DESC

http://nast-sonderfahrzeuge.de/MB-Exotenforum/board_entry.php?id=75999#p75999


Engine appears to be 7.0L and approx 485hp (not the 7.4L rated at 575hp).