Questions on port development

[macports at parvis.nl]

I'm working on a port for munin 2 as the current macports version 1.4.7 is of 14 mar 2012.
The munin-node seems to work fine, the server part requires more testing.

(1)

I need a port install munin at 2.0.35 buth without a destroot phase.
Is there a dummy command for destroot.cmd that allows to build without install? exit 1? 

(2)

To prevent clashes with the current macports installation, I think it is best to create a second one.

Guide 2.2.4 Install Multiple MacPorts Copies ( https://guide.macports.org/#installing.macports.source.multiple ) talks about that. I assume that 2.2.3 Git Install should be done before. confirmation please.

(3)

If I succeed in making this port, how should I do it?
- create new port munin2 with no relation to munin @1.4.7
- make this an upgrade for the current version.

thanks,
paul de vries.