80 Mb / enough for 7.x? OK to delete /stand/ and /modules/ ?

[fbsd2]

Greetings list,

   Given recent EOL announcements, I'm trying to upgrade an ancient machine from 5.5 to 7. It has 80 Mb total in the root partition, /home/, /var/, /usr/, and /tmp/ on other partitions, and NFS mounts /usr/src, /usr/obj, and /usr/ports from a slightly newer/faster box.  I've seen

http://www.freebsd.org/releases/7.0R/relnotes.html   and
http://marc.info/?l=freebsd-stable&m=121278826119286&w=2

which seem to suggest that even with INSTALL_NODEBUG during buildkernel, 7 might not fit in an 80 Mb /.  Must I partition a new disk to give more space to /, or can I find more space by deleting /stand/, /modules/, and possibly /rescue/ to shoehorn a custom 7.x kernel in the available space?  TIA

Alex

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