cool question
You want to maintain 70 fields from ONE entity on ONE panel.
Traditionally because there are so many fields people have used a Tab pattern such as PatternFactorys (available for free at StellaTools)
pFA3/EditTabSingleEntity
Multifunctional edit function with tabs to be able to create, change, delete, copy and display database entries from one function.
or
See OBASE/Entity With Tab Dialog pattern (which was not directly migrated to PATTERNS back in 1998)
BUT
This was how people have achieved it in the past...I guess you want ONE panel with a fixed size which allows you to scroll down through all the 70 fields..like a webpage.
This can be achieved by using SPLITTER WINDOW I would guess. Plex help is your friend.
"Splitter windows are divided into two or more panes that end users can resize by dragging a splitter bar. CA Plex enables you to design splitter windows with both horizontal and vertical splitter bars."