I have yet to do a Honda, but have done 3 other small Japanese sedans (Mitusbishi Eclipse, Toyota Corolla, Nissan Altima) with an empeg and another head unit. My experience with all three is that the "double din" spaces are about 1/4 in. too small to accomodate an empeg and another head unit without trimming.. All three have required holes in the side of the sled to bolt the sled to a mounting bracket. All three have required trimming of the bezel to fit the empeg.

That said...with some nice trim work and a little squeezing and cramming, all three have ended up fitting and looking good.

Link to Tony's 2000 Accord Gallery
Link to Docring's 1994 Accord Gallery