Tips for building if I can’t use modular building

I love Jurassic World. I have bought the game but my PC can barely handle it - it’s way under the minimum requirement and 6-7 years old. Luckily, I will be buying a new one in the new year so that I may play all my favourite games without limitations. But before then, I want to build a Jurassic World, just one since after that I will have the new computer, with only blueprints and maybe the occasional decoration. What would you do?