I haven´t trie with other layout, when I run MAME from attract mode the games run in the correct resolution.
I´m using windows 7 in 1024 x 768.
I set windows in 800x600 (It is the lowest resolution it let me use) and i had a distorted image, very similar, but not the same so I supose the problem is that attract mode can not "talk" with the Hantarex to set the correct resolution.
When I exit from attract mode windows 7 is shown in wrong resolution, the desktop is a distorted image.