OK, so these are an interesting addition. Giving new players a jumping-off point is a nice idea to spur inspiration. (Was this related to your mega-tech project at all @Zeena?) The obvious thing I'll point out is that their novelty will wear off almost immediately for experienced players, so a tick box to avoid having them spawn would be great. Minor point - the HE tech is called "Harvester". How about "Tank" instead? Also, the techs seem prone to being placed up trees, initially. And how about a more creative, rainbow coloured block build, or something...?