So.. I original posted about this here and here, but thought I would start a new thread as BluCrawler's gone through a number of revisions. Again, credit to PunkTacoNYC for his original build - Chilly Crawler (for which this started as). I've been tracking revisions and experiences as I go through iterations. Im pretty happy with where I am at now. Still not 100% on the steering approach, but I've noted details about ideas for a future version of BTBox. As it stands now, this thing is very solid and pretty much climbs anything:
PlastiBots - BluCrawler