Pete the respect was dually noted
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As a youngster I had way more cars than the average person so have had a myriad of experiences with "stuff" happening; a lot of the cars/toys were hashed together when I bought them. The reason I brought it up was the long runs of pushing a liquid, the dia. of pipe and and tight corners and the air pockets might be involved. I remember having to "burp" cars cooling system at al.
Yes, there are a lot of sizes of radiator available but remember to match the radiator's capacity to the engine and check the air flow through the radiator based on where it is to be mounted. Don't mount it flat as it doesn't seem to work. Two radiators don't seem to work well especially when mounted sideways to the airflow when the vehicle is moving (seen that more than once). The same with sideways mounting a single radiator as in either case, the addition of scoops don't seem to want to do the job well.
#2 is s/b correct but remember "Murphy's law". I've seem some creative cooling systems in my life; some work, some don't.
#3 is dependent on a lot of things. I always look at the worst situation (again, Mr. Murphy's discussion) then build back from there. Since I am not sure about a lot of things about your buggy's body and build it is it hard to say certain things for sure. Not all glass buggies are built with the same open areas or access. My black buggy for instance has no under hood access and it too low and flat to use for anything.
buggy7 (2) Truss bar note.jpg
Note: in this pix the radiator was going to be up front but things just got too complicated to do it and I was advised not to go that route. Even a radiator mounted in the rear seat would have been better and that isn't saying much either.
I have seen a few V8 VWs and not in rails plus there is a glass buggy in one of the "groups" of sand riders I know which has a Cologne V6 like mine in his; if I remember correctly, a short wheelbase Manx style buggy. I seem to remember it has (I just found out the other day that it is still around) cooling problems due to the "squeezed-in" cooling system. I haven't seen it for many years so I don't remember just what they did. The last I had heard they were planning on pulling the engine and trans to put in a bus then doing something else with the Manx style buggy.
#5 is probably correct depending on temps the system has to hold and the materials used. I used to hang out at a muffler/speed shop and another friend's radiator shop and have seen a lot of hashed together things come in to be fixed. It was there where the discussion on long runs
under the car came up. Off-road this can be a problem too especially the vulnerability to bottoming out. Also, some of the "great radiators" turned out to be not that great either due to capacity, air flow through or moving the fluid through it.
Lee
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Cackle, cackle, cackle: welcome to the land of the glass buggies. Been fighting with similar problems on two of them. Stand back and take a deep breath, relax, get a can or bottle (the clear thinking limit is something less that a 6-pack) of "barley pop" then maybe build some cardboard mockups of what you are trying to install to place in different locations you think you might want to use. Get a couple of rolls of tape also as you probably will need that much.
(shush...) I heard a secret many years ago that as far as Japanese cars go there is/maybe is a secret cross-reference book for identical/interchangeable parts P/N vs. P/N (company vs. company).
. Putting engines into places where they didn't belong was still very common back then.