tried to get inside but cant. any specialized way inside?

nvm ran through your page and found the answer. - f key

How to get to the factory?

Okay Danke Schön

We have to be carefully to don't re-enter when we just exit from it. :(
(Release the key immediately.)

Do you have a mod that increases pickup radius? With only Free Real Estate installed it shouldn't put you close enough to re-enter like that on either side

A thought for the dev: you know those pop-up message boxes one sees during the tutorial? Maybe a few of those would enhance the usability, like after you place your first factory, a message that says "approach the door and press (key bound to picking up things)" and another couple with cover the refresh key and changing the name once you enter the factory...