For those interested in building the 4355 Monitor I have cleaned up most of my drawings. I have several more to go and will try to add them as I get finished.
Baffle layout in sililar to that of the 4350/4350B but there are slight differences in the location of the component cutouts. The big difference is of course the single port on each side of the 2235H's. Diameter is 5 3/8" I.D. and finding the correct size tube is proving to be a challenge. JBL used rolled cardboard type material for the duct tube. My detail showing the dogleg shaped tube is only approximate. I will post more accurate drawings when I actually find the tube material and build the duct.
The internal cabinet dimensions are identical to that of the 4350/B as is the gross internal volume. The Mid-Base box also is the same as the 4350/B. Only differences in internal bracing changes the net internal volume.
All of these details came from the only pair I have had an opportunity to open up and inspect. There may be minor differences between models, but I suspect due to the short production run that they are all the same.