spacebuild help!

i got spacebuild3, LS3,LS3E,RD3 when i go to a planet map single player i see all the addons say there enabled but when i leave the planet theres no atmosphere or low gravity i just falll to the floor of the map and i can get out and walk around. am i missing something?

anyone?? id lovw to build a ship solo

I believe a guy named Morcam offers tutorials on his YouTube.