Has anyone converted a Hyper 7 pro

[BrianG]

Just make whatever holes you need. From experience, I would recommend using the 4mm screws since they hold better. Drill 4mm (5/32" is close) holes in the chassis, and then 3mm (1/8" is close) holes in the tray so the screws self tap. Don't forget to countersink the holes from underneath the chassis. A couple points to consider for tray placement though:

1) Make sure your holes don't end up where the velcro is going to go.

2) Try to make it so that the velcro strap is not directly near the spur. If the tolerance is close, it could rub.