1) If you want to benefit from the build speed bonus in a friendly deploy zone (like you tried in the beginning), the dead centre of your crawler has to be inside the zone. For the Nod offense crawler this is pretty much the point exactly below the cannon.
2) Basilisks and Stealth Tanks are not good vs everything. In fact, both are pretty bad vs most units. Basilisks are really bad when the enemy has Titans, Zone Raiders or Paladins. Stealth Tanks are only useful to kill Orcas and Hurricanes or to get nodes.
3) Hijackers are almost always a horrible choice and even worse when Kodiaks are around. Also they need to be backed up by repair units.
Yep, Uou are right, in fact I should focus on how to play well with nod, I'm working on it lately. thanks for the advice, I always held you in great consideration because of it. I should point out that I am a relatively young player, and I can only get better I suppose.