I don't have the mods on my HH.. as I purchased the zip model so my input is just this.
I highly recommend side entry as opposed to bottom entry. If I were to modify the HH I would go for the full unzip mod that way you have access for both gear and body.
I have recently switched to the WBBB, and I love the side entry on both my HH and WBBB.
My son has the bottom entry HH and is thinking about going with the Mod 3 or 4 and closing up the bottom.
Just my thoughts.