The idea of the bootstrap image is that you can then use it to run haikuporter and build more packages.
I don’t know if we plan to do that for beta6 already (may be a bit early and we don’t want to delay the release further), but later on we will likely set up a buildbot for haikuports. It may also be easier to do so if we can run this on a native ARM system (or virtualized on top of one), to not have to emulate the CPU and have things run too slowly.