Problem is the looks; you have to cut the plastic of the inner part, fill in with landscape forming material at the outside. Electrical it's no problem; to get it work you just have to make sure that the tongues that normally is fixed to the track is grounded when a train passes; use contact tracks and a relay, or make your own by isolating the rails of your tracks and make the axles do the grounding.

But to me it seems rather absurd. Buy some Viessmann stuff instead if you are prepared to do some work. Much better looks, inlcuding slowly moving bars. Faller used to have building kits, but I'm not updated here.

Dear Lars and Thanos
thank you for your answers . I think I'll modify Marklin
level crossing adding styrene sheets in order to fill the gap
for the road . I want to use Marklin level crossing all the
way because atfer 20 years of DC trains now I have
" the Marklin syndrom " and I feel fine when I see a white
box with Marklin logo in red!

Ciao Marco

Hi Thanos
Remember always my personal motto:
Ich bin lokfuhrer bei Marklin und Fleischmann !
English translation : I am Marklin and Fleischmann cab engineer!
For amusement only ,of course !
Ciao Marco