Many thx for the photo. I have seen photos showing the car before the renovation. The car had cut-outs in the front - for the steel bumber, US-model side turn indicators on the rear wings, a telescope Antenna on the front wing and no Bat-kit.
However, the car is a city-pack. It came from the factory with steel bumpers, front and rear. The thin gauge is logically most likely not there. It could have an impact on the value. On the other hand, it's not many of the last batch CSLs which are really light.
It's one of the very last CSLs (only 8 cars after this one). Also, one out of four Taiga in this serie. And it's definitely a CSL. Although, a "heavy" CSL Bat with city-pack, power steering, rear power windows, power mirror etc. One could say, it's a fully loaded CSL. The only things missing from the CSL-option list 1974-1975, are the AC and the Bamberg car stereo with micro. But, I really do understand your question as "L" stands for Leichtbau (light).
I have noted that the car, also after the renovation, has the usual small "errors" (wrong rear emblems, wrong kidney, several wrong details in the engine bay etc). All, very easy to correct.
I think the value of the car is really high. Of course, under the condition that the renovation has been properly done.
Cheers
Henric