You can make a 4D PDU work, with an engine focused roll. It's only a couple tons you're saving though. This is a hard ship to shave weight off for jump range. The "modable" modules that other ships gain a lot using lightweight dittos of doesn't do much on this ship. They're generally already small and the hull can unfortunately not be fixed. 
I would replace your 4D reinforcement packages with 2x 1D module reinforcements. They're as useful for what you use them for, to protect against the odd heat damage incidents. You won't get too many of those as long as you don't fall asleep inside a white dwarf.
Your power plant is way too big! With a bit of power management and adjustments, you can use anything as small as a 2A plant with a grade 1 overcharge. The grade 1 overcharged power plant is the explorer's best friend. It's "cheap" to roll and with the right secondary effects it can be as cool or even cooler than a stock power plant, with a big oomph boost. As an explorer, unused power on your plant is good, it means it'll run cooler in super cruise, which is one of the most important aims when your days consists of arriving at and scooping star after star. This is also a reason I use low power shield mods on my ships (though powering off the shield while you're travelling is of course even better, it's not doing anything for you when you're travelling other than generating heat).
This is what I'd tweak your build to:
https://eddp.co/u/iWsEror7
I would replace your 4D reinforcement packages with 2x 1D module reinforcements. They're as useful for what you use them for, to protect against the odd heat damage incidents. You won't get too many of those as long as you don't fall asleep inside a white dwarf.
Your power plant is way too big! With a bit of power management and adjustments, you can use anything as small as a 2A plant with a grade 1 overcharge. The grade 1 overcharged power plant is the explorer's best friend. It's "cheap" to roll and with the right secondary effects it can be as cool or even cooler than a stock power plant, with a big oomph boost. As an explorer, unused power on your plant is good, it means it'll run cooler in super cruise, which is one of the most important aims when your days consists of arriving at and scooping star after star. This is also a reason I use low power shield mods on my ships (though powering off the shield while you're travelling is of course even better, it's not doing anything for you when you're travelling other than generating heat).
This is what I'd tweak your build to:
https://eddp.co/u/iWsEror7
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