Here we have a 1mm thick plastic cover to put on the bottom of your chassis to protect them from scratches comes with tape enough to last ages and the plastic is very flex able and strong and does not way much £5 posted for cover and tape.
Attachment 21323
the picture does not do it justice really i have sold 15 of these and everyone has been happy i have got patterns for mi3 mi3.5 mi4 mi4lp mi4cx i can supply enough for you to draw round your own chassis if wanted.
thanks