Gradebook

hi, i currently use gradekeeper as my grading software. gradekeeper.com
moodle 1.9.4 [i can upgrade easily since it s godaddy hosting]
i have the following categories:

midterm/final 20% weighted avg.
projects 15% weighted avg
quizzes 10% weighted average
classwork 10% weighted avg
participation 10% weighted average

thus the students get a grade every week for participation, and another for classwork, as well as either a quiz or project due.

a. could i setup moodle to represent this if i enter the classwork and particiaption as offline activities, as i do the quizzes, and mid term and final
and then have moodle do the weighting average for the student grade.

also, is there anone or anywhere that could write an link between my gradekeeper to the moodle grade module?
thanks
m