@conviction ok

@CanadianAircraftBuilder Now I solve the problem and update the mod,try to work it again

@CanadianAircraftBuilder thank you for your advise,I will solve it soon

@CanadianAircraftBuilder I found the problem just now,when the terrain under or on the top of the construction area,the blueprints will disappear,now just one idea to solve this problem----remove the terrain which under the construction area

Hello there @conviction , i would like to tell you there is a bug where the blueprints wont appear with this on, hope you can fix it soon!