To your question:

Go to C:\Steam\steamapps\common\Empyrion - Galactic Survival\Saves\Games\NewGame_6(the game where you have a base and the ship you want to convert)\Shared and in that folder you should see the creations spwaned in your world. open the ship you want as base an copie 0.area and ents.dat and place them into your base safe (needs to be only the starter block) if that is not working try it with a combination of only 2 files you find in \Shared\1015 and place them in your base safe

Forbidden Blocks:

Open console and type: prefabinfo name-of-blueprint
it then tells you what for blocks that are wrong.
if its old or too many turrets, you have to change or remove them manually.

Здравствуйте, дорогой Total Pipec! Ваши руководства прекрасны, я бы хотел пригласить вас на свой дискорд сервер, посвящённый руководствам стим. В основном, люди на сервере рекламируют свои руководства, общаются, делятся опытом.
Если вам интересно, то примите, пожалуйста, мою заявку в друзья, и я вас приглашу

You are a helpful and correctly dude.... Nice to meet you :)