Gator, I have been involved in many High speed Mods. You are correct in worrying about the Landing system. Tape systems will not work. I was lucky in that I worked for a Major who used Readers and a Vane at each floor. I assume the Gearless are DCV, and you are retaining the Rails and Pit Structure. before I retired there was a company that bought the rights to the Miprom System from Kone. We used them on a Mod and had good results. I believe the name was C-Tec. However that Mod was ACV. you may try them. Getting a DC Drive may be tough. This job sounds like a Major wrote the Specs.