Are you asking for cue sheets from BIN+CUE rips of originals, or cue sheets for ISO+WAV or ISO+MP3 rips? The latter can be easily created, given you know the number of data tracks (and their MODE) and the number of audio tracks. The former might require some time to compile.
Other than Eidolons Tavern that you mentioned and the Sega CD and Saturn Music sections that are currently offline here at SX, I've not seen any Internet source with the information you're asking for. Having this information is a good idea though.
oh oh here is a good question i need the .cue for metal slug iso/mp3. found 3 different copies to download but all three are different. one has 1 mp3 but. the other two have the same number of mp3's but there are huge size differences between the lot.