You have the right idea without a doubt when it comes to corner creation but lane changing is so "individual" to each lap of the race... I try to think of a layout as "telling a story" each corner designed to do "something" to to the cars to make a lap interesting... the limit with the lane changers, especially the clc's is that story is limited to a single lane and that lane may not be where the excitement is each lap, both cars may be in the other one....
You set my mind thinking about my "loft" and whether when i get up ther to make a layout where i "rout" a wide slot and drop in the "digital electronics" cut from the plastic track for the lane changers and a normal 3mm slot running into them and out of them to create more of a flow so there isn't the limitation of the designs available... you are certainly pushing the envelope using what manufactures make available to us and inspire us all...
My next layout is just for fun, analogue and will complete my wall mounted "trio"... then got a house to sell... then once the summer gets here (if ever) i will prepare the loft in the meantime i'm gonna race as much as i can on my digital layouts and see what it actually adds to the mix... not 100% certain that 4 cars on two lanes gives enough variation, your three lane corner certainly creates a great piece of trackwork that looks fab and probably is a thrill to drive... three cars heading into it neck and neck toward the finish line and it could be carnage! but thats the problem with digital itself... the car infront is a roadblock or a toyota if its just accelerating!
I dont think any manufacturer of "digital slot racing! really knows what it should bring to racing except more participants... 4 people racing is so much more fun than two but six and it becomes "deslot" hell on a small layout... think we all have loads to learn but after five years i think we have done pretty good to get what we have in SSD with PBPro, SSDC etc... now with lars on the lane changers we could be heading for version 2.0