That should be an easy diy for yourself. Get rid of the acrylic dividers, silicone doesn’t stick to it well. Clean all the old silicone off the glass of the aquarium. Have some new glass cut to size for your new divider panels then silicone them in place. Just use 100% silicone, nothing with mold resistant additives in it and you should be good. I have a 75 with dividers in it I’d sell also if you don’t want to mess with it but everyone likes their own sump design.
Jeff