Can units be joined into a bigger building? 可以多箱拼接成大空间吗？

Yes — single-floor width up to 6 m, two-floor width up to 4.5 m, height up to 6 m, length almost unlimited with connectors.

可以，连接件拼接：单层宽至 6 米、二层宽不超 4.5 米、高不超 6 米，长度基本不限。