SG Blocks, Inc. announced that SG ECHO has been selected by HTR Investors for full suite architectural consulting and engineering services to build RV and Glamping units. These will be built with the intention to deliver to various campground sites across the U.S. The design build contract is for approximately 150 units. HTR Investors is a vertically integrated real estate investment company, formed with the focus in mind to consolidate within the highly fragmented RV and camping industry.