Question for dual-single-DIN installs...

[WolfWings]

...what's the best way to accomplish this feat?

I managed to corral the stock Toyota mounts for now, but everything looks sunken in a bit too far for when I get the 180mm surround trim. I'm thinking it's because while I got the stock stamped-steel Toyota mounts to work, they're not quite the right alignment for the task.

I already have the single-DIN Metra kit, Crutchfield included that for free. If I picked up the double-DIN Metra kit would that let me continue mounting the lower CB with side-bolts (the only mounting option for that, sadly) but still give me some way to properly attach the 'cage' for the upper head unit?

Or do the 'cages' always end up seeming a little flimsy even when installed correctly, compared to just bolting things down in place like I'm used to with stuff like CB's?