＞＞１
It's easy. First choose an engine. For an instance: wakaba (Perl/CGI) or Kusaba (PHP/MySQL).　Then choose a host that provides these services (depending on type of engine) and doesn't have a limit per file (or it's >500KB).

When you find one, please, post it here. I search for Perl/CGI with large enough limit for my personal files.

But there is one more question. Do you REALLY need your own imageboard? If it's for some special purpose - it's O'K. If you want to be like famous imageboard owner's name here, then forget about it: there are too much of these small pounds with a few user, that hope to become popular. You'd better stick to one of existing ones. Become an elitist with secure trip or something like that.ww

And one more option: anonib