Looking good so far.
I'm sure after a nice wash and some dry-brushing, it'll really standout.
The adding of hydraulic lines or any aftermarket parts should have taken place during your build. Not to say that you can't add them now, but you may find yourself re-doing or having to touch up areas where you've already worked. Could be a tedious effort on your part.
My advice would be to let it stand 'as-is', do your weathering, and save the addition of hydraulics lines, phote-etched parts, etc., for your next project.
Keep us posted