WebObjects 5.4 on Linux (Red Hat Enterprise)

Dear WebObjects Community,

I am a seasoned WebObjects developer for many years, until version 5.3. I have not done done any development on the latest version, 5.4, yet.

I now have a client who urgently requires a new SaaS application to be developed within 4 to 6 months. I have evaluated different technologies and it seems that WebObjects is one which can promise delivery on time. BUT there are issues which I need some answers:

* Linux (Red Hat Enterprise)
Development work must be done on Linux (Red Hat Enterprise). I have read something on WOCommunity.org that the initial installation needs are Mac, and after that the packages could be moved to Linux. Is the installation process difficult? Has anyone done DEVELOPMENT work on Linux using WebObjects 5.4? -- I need to be very sure about this. Thanks!

* WebObjects Builder
Apple has deprecated most of the WebObjects development tools, including WebObjects Builder. So, what is the equivalent or replacement for WebObjects Builder, to build applications on LINUX?

I appreciate your answers to the questions.

Kind regards,

Kevin Pan.