It is a seven foot panel with slides at both ends already. It is a see-thru panel and cannot cosmetically accept a slide in the middle. I'm primarily worried about warping in the center over time and causing a scraping. Trying to maintain a 1/8" gap or so. A felt pad may suffice but I kinda worry about it rubbing off finish/stain eventually. The duty cycle is maybe once a day.
The sliding door parts sounds like a decent lead.
OTOH, a re-evaluation of my design to avoid the conflict entirely may be the best solution.:eusa_thin