Install heating pipes before or after the floors

[Ring-Free]

Hi guys,
what makes more sense? Insert the front and cargo floors first and then install the heating pipes, or would it be better to install them in a different order?
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my current challenge

https://www.thesamba.com/vw/forum/viewtopic.php?t=779910

Instagram: ringfree_marc_roder

[pondoras box]

I did all the conduit and heater pipe in without the floor and it was nice being able to access everything from the top without the floors in place.
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Looking for anything from Hal Casey Motors out of Hamburg New York, from license plate surrounds to matchbooks.

1961 23 Window (Bobo)
1965 11 Window (Zelda). https://www.thesamba.com/vw/forum/viewtopic.php?t=563183
1965 13 Window (Lucas)
1957 Oval ragtop
1960 hardtop
1964 hardtop
1965 hardtop (Arschloch)
1973 standard bug (Dirty Gertie)
https://www.thesamba.com/vw/forum/viewtopic.php?t=804912
1988 Cabriolet VR6 conversion

[mdege]

The section under the floor can be easily installed after the floor has been welded in. that was one of the last pieces to go in on mine.
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- Michael

1965 21F: Restoration of a former '65 firetruck
1963 Typ3 Notchback project
1988 Multivan Magnum 112i
1984 Standard: My son wanted a bug for his first car