OK... Stupid question time....

What is the minimum the baseplate should be from the bottom endcap???

Im working with 20" tube and have a RLp15. This is very important as Im thinking about losing the baseplate and going with the Casters

However all I can get is a set about 2.75 Inches from the floor...
Im almost done with it and will post Pics as soon as Im done... It should look pretty run of the mill however, I did use automotive headliner for the outer tube... looks pretty good if I do say so myself. It is easy to get and seems to be one of the default colors for the stuff so it is in abundance in any Automotive Upholstery shop... The alternative would have been OZITE but that is another story...
Any help would be a boon... Thanks
Dan