For the conversion, you only need to read the official guide. All you need is in that guide. If you have difficulties on some point, i can help you with some tricks that i know. Russian link: http://spaceengine.org/ru/manual/making-addons/creating-a-ship

Опыт в моделировании есть.

Вот очень интересует как преобразовывать модели в формат файла Space Engine ?

Oh, that can take some time. Perhaps one day i will do a guide. But i recommend you first to check the official Space Engine guide to create ships: it have all the necesary information, at least for convert models into Space Engine model format. The link for the english version of the guide is: http://spaceengine.org/manual/making-addons/creating-a-ship/ ...There are other things like some basic principles of modeling and texturing that are more related with 3d design in general, not only with model conversion into Space Engine file format. I know the game is from your country and i'm fan of this Vladimir Romanyuk masterpiece. So, i think you can find the guide in russian for sure.

Был бы очень признателен если ты сделаешь гайд по созданию модов

Any software with compatibility with most common 3d file formats can be useful to do mods. I use most of the time Blender and 3ds Max. And Photoshop for things like textures.

А какие программы используешь для создания модов ?

Is true. You can change easily the size of the ships in the .sss file inside models folder. I notice if i make the ship in a normal size, this causes bugs for the cameras: in some cameras the object dissappears. Only solution, oversize the ship...

I noticed that while the ships are really good, they seem to be very oversized...

Hi! No, i only can do this with X4, because the method is clearly explained in Egosoft website. Im not a pro 3d designer, only an entusiast gamer. You can check the other ship i upload today, the Cerberus Vanguard.

С Х3 теран конфликт сможешь корабли импортировать ?