Hot on the heels of four filings totaling $717 million, Tesla Inc. filed to build yet another 100,000-square-foot-plus facility at its gigafactory site. Could more construction plans roll in? So far, the company — which has been bleeding cash on Wall Street — is poised to pour more than $750 million into the Austin site. This article details what we know and also includes a list of the largest manufacturers in the region to put all this into perspective.