I think your problem is that "use lib 'whatever' " expects all the modules to be directly under 'whatever' and named accordingly. What you should do is add '/home/bthcraft/modules/Tk-804.027' to your PERL5LIB in your .bashrc (or whatever you use). That will put it in @INC

PERL5LIB=$PERL5LIB:/home/bthcraft/modules/Tk-804.027
export PERL5LIB
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Also when you install, you should use that directory in the perl Makefile.PL step:

perl5 Makefile.PL PREFIX=/home/bthcraft/modules/Tk-804.027
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If you are installing a binary package, you might have to adjust your directory structure.