The construction of my Voyage 1 has come to a standstill.

I've been working on a remake of "Voyage 1" recently because the previous one I made was completely off in scale and didn't even have the expanded to make it look more like a model, so I've been wanting to do a remake that's not only in the right scale but also has the mechanism expanded., the computer at my house, I don't know what's going on with it, once the number of parts in a work exceeds 300 or so, just won't let me into the game, causing the production to come to a standstill.