Hi sdmark,
You can read my thoughts about a local purchase vs a component mattress vs a complete DIY construction in post #15 here and the posts it links to. Which one is best for you really depends on which one you believe would be the best match for you in terms of PPP and the options you have available both before and after a purchase in case the choice you make don’t turn out the way you hoped for.
The Brooklyn Bedding Cotton Camilla would be the most closely comparable to the Dreamfoam Ultimate Dreams. There are fewer comfort options but you would have the ability to exchange the comfort layer after a purchase which can lower the risk of an online purchase with the tradeoff of an increased cost vs the Ultimate Dreams.
The Bamboo Bliss is the “next step up” and has more comfort options both before and after a purchase and uses higher quality base foam and a wool quilted cover so the higher cost also gives you less risk and better quality components.
The Sultan Favang is more of an unknown because you can’t test the combination mattress/topper in person and the combination isn’t a proven design because the Favang is designed to be soft enough to provide both comfort and support in the same mattress and may be softer than the support layer in either the Bamboo Bliss or the Ultimate Dreams. This could affect the choice of which topper works best for you in combination with the mattress and you would need to sleep on the combination to assess how well it works for you in terms of PPP. If you buy your topper from Brooklyn Bedding then they have an exchange option that would allow you to exchange the topper for a different firmness for a nominal cost so you would still have some options available after a purchase if your first choice doesn’t work as well as you hoped and isn’t a good match for you in terms of PPP.
I don’t think so no in terms of having the same options or using the same quality of components (base layer, latex top layer, quality of cover, options available before and after a purchase) but your DIY plan might fill the bill if the firmness of the Favang is a suitable base layer for you and you make the “perfect” firmness choice of a topper the first time and don’t need to exchange any layers .
Phoenix