The nice thing about the BrickStuff product if you are not familiar with it, is it is designed in such a way where you really do not have to do any modifications to the LEGO. The wires are very thin, and very durable so that you can simply 'squish' them under bricks. The light poles are drilled out though, and in a few cases I drilled through a baseplate because I did not have easy access to fishing the wires through another way. However I have not had to modify a single piece on any of the buldings, the hardest part is 1. hiding the wires so you do not see them. 2. making the levels of the modulars so they are still accesible without having a bunch of wire showing.
Also our entire layout is designed with 'play' in mind. My boys like to access all the buildings and play games in them. (Well my oldest boy now does not do much of that).
I understand the concerns about Non-LEGO, and we are somewhat purist. NO clone bricks, and I do have some custom stickers or pad printed accessories. The lighting though seemed highly impractical with what LEGO has to offer. I think it adds so much both during the daylight time, and the nighttime scenes that I am happy we chose to proceed.
It does have its dangers. It is taking quite a lot more supplies than I originally thought. And its a slippery slope, because once you start, its tough not to complete the whole layout. And furthermore there is a lot of time involved. Its not plug and play by any means. Lots of 'reengineering' involved.
But so far its been a fun project. Thanks for all the nice words, and if anyone has questions about doing this I am happy to help in any way I can.