Hi Dangeresque55,
That’s good news … and these are much better specs than the other Natural Splendor and assuming that it’s a good match for you in terms of PPP then there are no weak links in the design and it uses all good quality materials.
I personally prefer all latex to a latex/memory foam hybrid but if I were to use memory foam in a mattress I would use latex over memory foam rather than the other way around because I prefer it over having memory foam over latex.
My own preferences though may be very different from someone else and the design of a mattress that was a good match for me (or anyone else) in terms of PPP may be completely unsuitable for you to sleep on so I would never use “theory” or other people’s experience as a guideline for what can work well for you because there are far to many unknowns, variables, and personal preferences involved to use specs (either yours or a mattress) or theory at a distance to predict which combination of layers would work best for you (see mattress firmness/comfort levels in post #2 here).
If you do decide to build a DIY mattress by buying your own materials and cover and then putting them together yourself then I would make sure you read Option #3 in post #15 here before you begin so that you have realistic expectations of success and the learning curve and trial and error that may be involved and in some cases the extra costs that you may incur if you make any “mistakes” in your initial combination of materials and components in your mattress.
If you have a local mattress that you know all the information you need (type and quality of the materials and the firmness of each layer and the details of the cover) then you can use this as a reference point for a design that you have tested and confirmed is a good match for you in terms of PPP and buy layers and a cover that are as close as possible to the layers and components in the design you are using as a target but I would also be aware that there may be some differences between some of the materials in your target mattress and what is available for you to buy that may make a difference in your final result (for example you could purchase memory foam in the same density that has different properties than the memory foam in the mattress you are targeting). If the latex is blended Talalay from Latex International then these would be available to you in any thickness and ILD that you would need from the suppliers in the component post here. There is more about the different ways that one mattress can “match” another one in post #9 here.
Layers that are glued can sometimes feel differently than unglued layers but I would use your own personal experience to decide whether this was necessary or even desirable because there are also advantages of having a zip cover that gives you access to individual layers that you can change if you find it’s necessary. There is more about finished mattresses vs component mattresses in post #2 here and the two other posts it links to.
Phoenix