Hello, building a mattress for 3 people.
270lbs 5’7” side sleeper historically likes med-soft beds
150lbs 6” side sleeper historically likes soft beds
160lbs 5’6” belly/side sleeper historically likes medium to medium firm beds and can have lower back pain
We liked the EOS Naturepedic Pillowtop and are hoping to DIY a king bed. Wishing there were more options like the Alaskan king or a short Alaskan King (100" wide 80” long). Is it possible to put Twin XL and Queen components together into one custom mattress cover for this where it won’t feel like a seam or have a sag?
Idea so far:
Base: 8" full edge support 15.5 gauge quad pocket coils from Texas Pocket Springs
Transition: 3" Medium 28-33 ILD Dunlop latex from Arizona Premium Mattress
Top: 3" SuperSoft 15-19 ILD Talalay latex from Arizona Premium Mattress
Unsure of cover. Premium zippered cover from Texas Pocket Springs or one of the cotton or wool cover options from from Arizona Premium Mattress.
Your thoughts? I am excited to talk to experts and those who have already DIY a mattress.
Hey JayInSeattle.
Welcome to our Mattress Forum 
What you’ve got sketched out is solid, especially with that 8" quad coil base and medium Dunlop transition layer. They’ll give good support across different body types. The 3" supersoft Talalay topper will definitely bring pressure relief for the side sleepers, but since one of you spends part of the night on your stomach and has some lower back sensitivity, I’d keep an eye on whether that much softness lets the hips sink too far.
One option that can make this easier: instead of a single king-sized topper unit, you could look at doing a queen + twin XL side by side under one big cover. That way, the stomach sleeper’s side could have a slightly different topper or transition setup if needed, while the other two sleepers keep the softer feel. With a snug custom encasement, the seam shouldn’t be noticeable, and you’d avoid sagging between sections.
For the cover, wool quilted options from APM can help balance temperature and surface feel, but the sturdier Texas Pocket Springs premium cover is also a safe choice if you want a simpler, tighter fit.
All in all, it’s just a matter of dialing in that top comfort layer for alignment. And, of course, finding the right encasement. Hopefully some other DIYers will chime in with what’s worked for them!
NikkiTMU
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That would be nice to have a firmer section for our belly sleeper. Thank you so much for your help NikkiTMU. @Arizona_Premium would such a cover be possible for a big bed encasing a queen and twin XL together? Thank you.
No, we need a template to sew the cover on to and something that size would way to expensive to get a template for a single use.
Does anyone know of any other place that would make custom mattress covers like this?