Found this on Reddit. Someone did the Enterprise D in LEGO. A very well made design too and the saucer can separate.
https://www.reddit.com/r/startrek/comments/fdzm5m/i_also_recently_finished_an_enterprise_d_model/
https://www.reddit.com/r/startrek/comments/fdzm5m/i_also_recently_finished_an_enterprise_d_model/