So everyone has his/her own expectations and whishes for a build but theese practically always come with a certain cost. I dont want to talk you out of anything but maybe you can find some perspective here.
Keep in mind that, as far as i know the Ruby as well as the MQ cases would have to be reshaped so no advantage (except the irreplaceble advantage of a slightly flater rehaut maybe). Both are build for gen movements so you would also need a movement ring depending on your movement of choice. and for the ones of us willing to drill and tap there is also the option of using a gen spec crown on a raffles case (Athaja for exampe, also done many times here in this thread).
I just assume, that you would not want to use a 40$ Raffles dial in such a setup so the cost might even be higer. With all the work that would have to be done, parts like nice hands and a dial from said supliers (or mochacha etc). not o mention a nice period correct braelet and gen ETA / Selita from another source.
So on the pro side there would be: Nice fitting Bezel and pre installed crystal without extra work, original crown position and that "feel"
On the con there would be every building issue we also have like shaping, movement fixation and sourcing of the other parts.
so my focus here is a little bit on the financial side and what to gain from theese parts. i even have a ruby dial in my build but for that money, especially case and Dial id spend a few hunderet more and get a gen 5500 and a juky dial plus merc hands.
But that are just my ideas to this topic
I hope ruby and MQ call you back and if you decide to buy there i hope for the best expirience possible. In the end we all strife to a build as close to the real deal as possible i think