Air carrier pilot reported since temporary construction has begun; spot 42 is not identified on the AMM or Jeppesen charts and the ramp hold line is not clearly marked which could result in a potential ground conflict.

Narrative

This is a general safety report regarding taxi operations at DFW specific to spot 42 and spot 44 due to construction. The instructions from ramp are too general Bring it in spot 42 and hold westbound"; are usually the instructions. If you look at the temporary construction diagram for spot 42 it's not mark that well and is not marked at all on the AMM in jepps; so once again very vague. So in Aircraft X in order to bring it into spot 42 and hold; the ramp hold line is not clearly marked of where to hold; in addition; the 42 line merges to the left to join 44; so inherently it leads you to want to follow the line; which now can interfere with someone taxing out spot 44 (wingtip clearance). In addition; in Aircraft X in order for your tail to fully clear Taxiway K (especially if a wide body is taxing behind you on K); you will be past the spot 42 hold line and if you do not follow the left merge line now you are too close to the construction area; in my opinion. I have asked the Ramp Controller regarding the wing tip clearance between spot 42 and 44 with Aircraft X holding on spot 42; their reply was and I quote "yes you are correct it's very tight and we should probably not bring an Aircraft X into spot 42 to hold with an outbound aircraft exiting spot 44". In my opinion; I think these two spots 42 and 44 pose a potential safety issue with wing tip clearances; especially an Aircraft X holding on spot 42; with enough clearance to clear taxiway K and spot 44. In the future I will not enter on spot 42 to hold in an Aircraft X; I will ask to hold off or enter another spot until I can assure proper wingtip clearance; because I feel it's a huge safety issue and not enough margin to operate safely. In addition; it seems Ramp Control agrees it's "very tight and we probably shouldn't do it" they stated."