What is the lowest height adjustment?
16.1 ines, if you have any other problem, please contact us
Can you choose not to install the armrests?
YES, if you not want it , you can choose not to install the armrests
What is the wheel base made out of?....metal, nylon, or other plastic?
Does the lumbar support move up and down? Other chairs ive seen have straps for that but I don't see them for this chair.
No, our lumbar support can't move up and down, because through our questionnaire find that many people don't need it to move up and down, if you need it, please tell us, we will help you to solve it
How far back does it recline?
Chair reclines far enough to sleep in,love it so far time will tell.not to sure about arms had problems lining up two of the bolts ....but got it together.