Hi desidude,
If you are attracted to the idea of designing and building your own DIY mattress out of separate components and a separate cover then the first place I would start is by reading option 3 in post #15 here and the posts it links to (and option #1 and #2 as well) so that you have more realistic expectations and that you are comfortable with the learning curve, uncertainty, trial and error, or in some cases the higher costs that may be involved in the DIY process. While it can certainly be a rewarding project … the best approach to a DIY mattress is a “spirit of adventure” where what you learn and the satisfaction that comes from the process itself is more important than any cost savings you may realize (which may or may not happen).
If you decide to take on the challenge then I would either use the specs (if they are available) of a mattress that you have tested and confirmed is a good match for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) as a reference point or blueprint and try and “match” every layer and component in your reference mattress (including any springs, any foam layers, and the cover) as closely as possible or use a “bottom up” approach (see post #2 here).
Post #4 here also includes a list of the better online sources for mattress materials and components I’m aware of.
There is also more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support” and “pressure relief” and “feel” that may be useful as well.
The better options or possibilities I’m aware of for “finished mattresses” in and around the Houston, TX area (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in post #2 here.
Phoenix