Glenn, from what i saw in iBox specs was the widest wood one can cut is 1.5" . So doing 2+ inchs is not on unless you going to try without the guard.
I notice in one image that you seem to have changed the knobs on the front guard of your iBox. That looks like a good idea given getting purchase on the tiny thumb knobs supplied is well .......tough.
However...I want to alert you to an experience of mine and caution all about placing too much torque on a hold down like this.
On my first router table i used T track to hold down and secure my fence.
I used the rockler cam lever type device to secure the fence in position.
The way this works is a hex bolt is used that is sized to fit into the T track so as to prevent the head from rotating.
But...this bolt is steel. Its securing itself against anodized aluminum. So what happened over time was it bit in to the T track. This began to have the effect that loosening and then tightening the fence just a little away from the previous position became a pointless as the bolt would not hold.
On the IBox while assembling mine I noticed that they too are using bolts with hex heads in their custom extrusion for the front and rear rails.
I think its important we keep in mind their intention with regards to the purpose. The two blocks of machined mdf are intended as blade guards and in the case of the front one a positioner related to thickness of material being used.
If we begin to try use this guard as a material hold down and put too much torque on those front bolts, I am almost certain that this will damage the ability of this guard to stay in place and serve its purpose.
I think its important to stress as you have done with the "hold down block"
that material being cut needs to be clamped in an alternative manner, Incra shows the use of a wood clamp secured over the jig front to back clamping material against the fence. The fence being the reference edge.
Sorry for the hijack here, despite my diatribe above, i am going to upgrade my knobs but will treat them with caution and only lightly tighten.
I can easily see Incra coming out in future with further improved versions as they get customer feedback.
Thought i had upon seeing your Xmas idea was it would be handy to have a t track slot on the top, something that would allow anchoring of a clamp down that could dulfill the purpose of your block but that would be easily operable something like those toggle clamps you always using.
I guess we could pop rivet a T track to the top of the iBox. Just would have to ensure it does not interfere with contents where the fancy screw adjuster is.
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