Sorry, from here I am not much help
The "roland" was only a suggestion as a step forward as an example
not knowing what your application is to be used for, drawing size, etc.
I have used "roland" plotters on flat beds and drum in a previous job for accurate plots for customer samples and cutting "ruby" sheets for photographic purposes
I thought it may be of use to you.
My application required the bed and drum to be bi-directional for speed and accuracy of the plot ( ie accuracy to 1/2 the line thickness to overlay onto photo negatives and die-lines to suit the customer requirements )