Summary

All brackets mount without the need to drill any holes in anything.

Brackets: Back row left to right.

X axis carriage bracket: Mounts on the bolts that hold the upper carriage wheels in place. Longer bolts are required: M5 x 40mm. Nylon washers are placed on the bolts between the nuts holding the wheels on and the bracket once placed on the bolts to take up any gap from the wheel nut to the back side of the bracket.

Y axis carriage lower bracket: Has slots to place M3 captive nuts and mounts to the underside of the Y axis carriage using M3 screws through existing holes in the carriage bracket. It is a close fit and the servo motor does not need to be removed to install this bracket.

Y axis carriage upper bracket: Mounts to X axis rail using 2 screws and T-nuts. Mounts snugly up against X axis servo motor cover.

Brackets: Front row left to right.

Y axis frame drag chain mount: Mounts to underside of rail using screws and T-nuts.

Y axis end stop bracket: You may have to use this bracket to slightly move the limit switch to provide adequate clearance to the Y axis carriage upper bracket where the X axis drag chain mounts.

Designed to use a 10x10mm drag chain. Yes it can be a challenge to get all the wires through them but I was able to do it including an extra servo wire to the X axis carriage for a future Direct Drive.

Oh and one other thing. No drilling but some countersinking. Sorry about that but three screws interfere with the wires and drag chains, you'll easily see which ones.

Three Socket Head Hex Bolts that hold the upper side rail on need to be replaced with Flat Head Hex Bolts. That does entail countersinking the holes so that Flat Head Bolts will sit flush. The aluminum is easy enough to countersink with a cordless drill and a countersink bit that hardware stores carry.

Link to Drag Chain used:
https://www.amazon.com/gp/product/B07BM7D45Q