Hi,
Coolio that you got that far.
Nope, there isn't any block support, the tool only supports model based levels.
About the texture problem: Run MED, open your 1_testwall1.mdl model or another one then go Edit:Manage Skins and check to see if your texture images are there. And what is the information that shows up under File:Model Properties?
Be sure that the image format you are using in Maya is one of those compatible with A6-- being bmp, tga, or dds (maya doesn't do pcx).