Help... We don't know how to attach it...
YouTube Skyrise reveals and look for ones with scissor lifts in the thumbnails. You basically have to fix the bottom to a chassis, and then add a linear slide to the top and bottom. Also just a note, a 2 motor Starstruck claw is WAY overkill. You really should consider a lighter, smaller, one-motor redesign. Good luck!
same main idea as Mira, but gonna elaborate a little more on claws
First, agreed you don't need a starstruck claw unless you're wanting to crush the cones
Second, if you're looking at a top-down claw, look at ALBA OSIZR, probably the best top-down claw this season. If you're looking at a side claw, look at 21S's (or basically any of the cali teams that have competed with positive results) robot from a while ago, they had a great side claw. Lastly, if you're looking at passive claws, keep innovating. I've seen some phenomenal, unmatched passive intakes already being implemented into some very solid robots, and personally I believe they're going to be what most people have by the end of mid-season.
Keep at it though, you're making progress.
Generally a bar from the top front X point that does not move horizontally acts as a platform for you to attach your claws and manipulators. In order to keep this parallel to the floor, you generally do want sliders on the top to keep a nice level base up there.
Once you see this in action, that long arm of yours may want to be trimmed down a bit. It will interfere with the scissor X otherwise. Make it as wide as 18" open and you can probably start that way
Doing this does put a bit of weight on the front side of the robot though. It may or may not be troublesome.