Well I didn’t manage it to compile mod_svn without the apache compiled source tree, but than it works fine and fast. Also Python 3 did not work. So I took 2.7
Assuming that OpenSSL 1.0.0a and zlib are compiled in that source tree as well.

C:\python27\python gen-make.py -t vcproj --vsnet-version=2008 --with-httpd=C:\build\httpd-2.2.x-sni-dev-ipv6
 --with-zlib=C:\build\httpd-2.2.x-sni-dev-ipv6\srclib\zlib --with-apr=C:\build\httpd-2.2.x-sni-dev-ipv6\srclib\apr

Than just open subversion_vcnet.sln with Visual C++ Express Edition. Ignore all warnings about solution folders. Choose the __ALL__ project. Than change from debug to release. Start!

My sample config

LoadModule dav_module modules/mod_dav.so
LoadModule dav_fs_module modules/mod_dav_fs.so

LoadModule auth_digest_module modules/mod_auth_digest.so
LoadModule dav_svn_module modules/mod_dav_svn.so
LoadModule authz_svn_module modules/mod_authz_svn.so

<Location /svn/>
  DAV svn

  SVNListParentPath on
  SVNParentPath /Repositories/
  SVNIndexXSLT "/svnindex.xsl"
  SVNPathAuthz on
  AuthzSVNAccessFile "C:/Repositories/authz"

  AuthName "Subversion Repositories"
  AuthType Basic
  AuthUserFile "C:/Repositories/htpasswd"

  require valid-user