Hi
You could buy a second ecu for reprogramming
The ecu thing is very important, almost everybody starts asking for '5 psi only', but after a few weeks of boosting you will ask for more
A weekend? I would suggest more time, maybe a week for all assembly/fabricating and initial tuning
And if money isnt a problem, why dont you start with bigger injectors and fuel pump?
Do a search those topics have been covered recently
Keep us posted
Peace