the cleanest way to 'mirror image' the plans is to take the to the copy store [i use Syracuse Blueprint] and get them to make one right copy and on reversed copy.
then you don't have to remember to flip things, and you don't have to wax or oil [:'(] the plans to see thru them. [yea, the words are ****wkcab[:@], but you can read the right half.
FA[8D]