Not quite sure if this is the correct thread, but here goes. For logistics and funding you might check with Steve Jackson Games about running a Kickstarter for the book. This appears to be an effective way to gauge of market viability/response. Something to think about in all your free time. 
Secondly, I have wondered why GURPS uses one stat (Intelligence) for all mental & social situations & three for physical. Personally the 3x3 grid appeals to me (taken from White Wolf):
Physical stats Social stats Mental statsStrength Presence IntelligenceDexterity Manipulation WitsStamina Composure Resolve
These make up the Power/Flexible/Endure stats for the areas of Physical, Social, & Mental. This makes all three areas of stats important and equal. To compensate for having more stats you may wish to give starting characters a 25% to 50% bonus XP used for stats only. Although a reasonable cap for Strength (it costs 0.5 per level at high super levels) could help. Or as some people have said a damage cap per attack. Additionally, Dexterity might cost double since the ability to hit & not be hit is all Dexterity rolls, thus important to living.
Finally, I haven't played GURPS official rules since second edition. Take everything here with a grain of salt & don't overwork yourself.
Secondly, I have wondered why GURPS uses one stat (Intelligence) for all mental & social situations & three for physical. Personally the 3x3 grid appeals to me (taken from White Wolf):Physical stats Social stats Mental statsStrength Presence IntelligenceDexterity Manipulation WitsStamina Composure Resolve
These make up the Power/Flexible/Endure stats for the areas of Physical, Social, & Mental. This makes all three areas of stats important and equal. To compensate for having more stats you may wish to give starting characters a 25% to 50% bonus XP used for stats only. Although a reasonable cap for Strength (it costs 0.5 per level at high super levels) could help. Or as some people have said a damage cap per attack. Additionally, Dexterity might cost double since the ability to hit & not be hit is all Dexterity rolls, thus important to living.
Finally, I haven't played GURPS official rules since second edition. Take everything here with a grain of salt & don't overwork yourself.