1 - general thoughts about the unit.
I like mine, solid construction.
2 - biggest print that can be made on baseboard? (I believe it has the 240mm lens)
Vertical column is the main constraint along with the type of easel you use
3 - what do you do for variable contrast filters (above or below the lens)?
There is a provision for below the lens filters, Ilford makes 12x12 filters that you could use above the negative
4 - Do you use ANR glass in your carrier to keep the 8x10 negatives flat? Any other thoughts on this?
Beseler glassless negative carrier does a good job of keeping the negative flat, so I have not used a glass carrier
5 - total height from the base to the top of the column?
About 55 inches - you can wall mount it if you need more distance - most heads will extend above the column top at full elevation