Hi Otter4044,
You’ve probably seen this but the specs for the Beautiful are in post #2 here so if you believe that the Beautiful is “perfect” for you and you are trying to “duplicate” it then the closer the specs of your mattress come to the specs of the Beautiful (in terms of the type, thickness, and firmness of all the layers and the type of cover) the more similar it will be to the feel and performance of the Beautiful. Any difference in any of these can produce a mattress that feels different from the Beautiful in one way or another and sometimes even seemingly small differences can have a surprising effect for some people. Differences in the upper layers (which have more of an effect on “comfort” and pressure relief) will probably be more noticeable to most people than differences in the deeper layers (which have more of an effect on support/alignment). If you are considering a 9" mattress vs the 12" Beautiful you can read more about the effect of thickness in post #14 here.
If you are considering a component mattress (option 2 in the previous post I linked) then I would base your layering choices on a conversation with the retailer or manufacturer you are considering who will be in the best position to tell you which of the options they have available will likely be closest to the Beautiful for you (see mattress firmness/comfort levels in post #2 here). If you are considering building your own mattress from scratch (option 3 in the previous post I linked) and you are confident that the Beautiful is the ideal choice for you in terms of PPP then the the materials you will need to “duplicate” the Beautiful are available from the sources that are listed in the component post here. If you use a design that is different in some way than the layers in the Beautiful then you will need to use trial and error and your own experience to assess how they feel for you compared to the Beautiful and whether you need to make any changes or additions to your design.
That depends entirely on the other layers and components in the mattress (every layer and component in a mattress will affect the feel and performance of all the other layers) and how well a specific combination works for a specific person (body type, sleeping style, and preferences) in terms of PPP. For some people it may work well as part of an overall design so for them it would be a good choice and for others it may not work well at all as part of a specific design and for them of course it wouldn’t be such a good choice.
Phoenix