Looking for some help coding a Reason-style music app

I'm working on a program similar to Reason (in terms of GUI style), which I'd like to be able to support ReWire, NN-XT samples, ReCycle loops, VST, ASIO and MIDI.

This project is a culmination of ideas I've had over the past few years, having been playing with Cubase at college and Reason in my spare time.

The general aim is to create something fairly powerful but without exposing the user to too much jargon.

It'd also be nice to have it look cool, but not intimidating.

At the moment I'm working on a plugin interface, which will be used by virtual devices, as well as transformations, and to provide support for different data types held by tracks.

It's being coded in a hybrid of C and C++. I would like to be an OO purist, but unfortunately that'd take too much time. So instead I'm using what I feel is appropriate to get the job done.

The plugin API will thus be C-based, but with class wrappers. This will allow plugins to be made in a variety of programming languages.

I'm just looking for general design help, and possibly some coding - eventually DSP-related, but for now just fairly simple things like getting things displayed.

Anyone interested?