Well, I am not IG-88 but I do have some tips you can use...
First off, It looks like the main hilt piece is 7" correct? If so, I would argue it isn't cram-fu to the highest level, Because I have fit everything you just mentioned into 4" of 1 1/4" sinktube...
One way you could save space is by "stacking" components. For example, Your buckpuck, and soundcard can be stacked on top of each other and secured in heatshrink. That would take about 1" lengthwise in your hilt. 6" left...
Your switch, you can't do much about, however, you could mount your speaker between that little bit of free space between the switch and the choke. It would provide plenty of resonance, and protect it if you ever had to open your hilt up. so now,,, let's say 5" left.
Now all you have left to work with is your batts (1.5") and your recharge port. (.5"). That would leave you, in theory, with a wopping 3" of space left in your hilt...
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