1. and 2. Yes and yes. See here. I happen to be a natural-rightser, and in fact one of a rather fanatical and absolutist kind. Roderick Long is also, for whatever that is worth. (There are left-libertarians who are not natural-rightsers, but of course there are also right-libertarians -- David Friedman, for example -- who are not. The issue is more or less orthogonal to the left-lib/right-lib divide.)
3. I don't know exactly what you mean by that. I wouldn't call myself a "voluntaryist" as that term was used e.g. by Wendy McElroy or Carl Watner, and I wouldn't call myself a "voluntaryist" as that term seems mostly to be used today within the movement. Not because I am in favor of involuntary social relationships, but rather because when I've encountered the term it usually seems to come along with a pretty hefty package of additional beliefs about ideal libertarian social and political strategy (for example a fairly "thin,"Â anything-that's-peaceful specification of what social or cultural goals libertarians might care or might not care about advancing through non-coercive means). And while I'm happy to get as fire-breathing and radical as they are about defending the principle of consensuality in all social relationships, there is a lot in the package of additional beliefs that I am not necessarily interested in signing on for.
4. Sure; given that everyone involved consents to the arrangement, in my view you should be "allowed" to do whatever you want without de jure restriction. However, I have some reasons for thinking that you might have more trouble than you expect to finding a market for your wares -- workers may not be interested in buying the kind of arrangement that you are selling.
5. Yes. Again, no de jure restrictions. However, I think that both natural and social factors would tend to produce some quite stringent de facto restrictions on the kinds of scale that you're likely to be able to maintain without aggression, privilege, state subsidy, or insulation from competition.
6. Well, that's not really a question I can pot the answer to in a short forum post or even a long one. I could say that I think it both more efficiently satisfies consumer preferences and also that there are independent ethical reasons to favor it, but my reasons for that have to do with a lot of threads of argument about a number of related, but importantly distinct, topics. Anyway, if you want a broad overview of some of the reasons I have for taking the approach that I do, the Liberty, Equality, Solidarity essay that I linked above may help as a starting point. And so might Bits & Pieces on Free-Market Anti-Capitalism.
7. Not as I understand it. I am an individualist Anarchist.
I do defend (and other left-wing market Anarchists also do defend) some economic or social arrangements that other libertarians have denounced as "collectivist" -- for example, the occupation and reclamation of abandoned faciltiies by squatters and urban homesteaders; voluntary unionism; cooperatively-managed worker-owned shops; and consensual communal ownership of open commons, without the involvement or management of the state. But the reason that I defend these things is because I think the charges of "collectivism" are in fact false, and the way I defend them is generally by trying to show, if I can, how they are really quite compatible with a radical interpretation of individual sovereignty and equal liberty. Maybe I'm wrong about that, of course, but if so, it is in the way that anyone can be wrong about the downstream applications of their fundamental principles.
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