Customizing Sign-up Page using Upfront...?

Hello!

I have been looking into making a nicer looking Sign-up page....

From what I can see, most people are using custom form builders to achieve this task.

I saw this thread..
https://premium.wpmudev.org/forums/topic/new-unofficial-plugin-gravity-forms-integration-with-wpmudev-pro-sites
But gravity forms are too expensive for what I want to achieve. So..

1] I am wondering if its possible to customize the sign-up page using Upfront ??
2] If not, are wpmudev plugins compatible with gravity, formidable, and VFB form builders? If I am looking to just build a simple sign-up page, what would you recommend?

Thank you in advance,
Calvin