I still can't get Tapestry to build under Maven but yesterdays "current peave" appears to be innacurate. I don't know why, but redoing the same steps now seems to work.
Next step is to get my tweak to the clover plugin to actually work.
Update to the update: my maven bulid keeps failing with OutOfMemory error. Don't know why. That explains the discrepency ... yesterday, I wiped out my %MAVEN_HOME% before building and the result was a partial Maven install that fails when building HiveMind.