Some great sci-fi creations I missed along the way. Somehow I missed Nnenn's great TB12-Porcilm dropship, but thankfully Snoikle and the Brothers Brick both pointed it out. The awesome thing about this is how it opens up to let out little rovers. Check out the use of guns as a chassis on the attack rover.
DRK-1 has a great Blacktron base.
JordanN has a whole series of great Battletech Mecha.