Paul Reubens Active on Various Projects in Final Months Before Death

Paul Reubens was a busy man before his sudden passing this week -- as he privately battled cancer, the guy was hard at work almost right to the end ... and there'll be something to show for it in the near future.

Sources with direct knowledge tell TMZ ... the 'Pee-wee Herman' star had been actively involved in various different film/TV projects in the final months of his life, including an upcoming HBO documentary (focused on his titular character) that was announced in 2021.

The doc is being helmed by the Safdie brothers, and we're told producers were able to get all of the interviews and insights from Paul himself before he died Monday.

Our sources say Paul had good and bad days toward the end, but when he was feeling up to it ... he was able to get quite a bit done ... spending upwards of 40 hours on interviews he did for the HBO doc. Between that and other interviews from over 25 different friends/collaborators, our sources say the 'Pee-wee' doc has over 1,000 hours of footage.

In addition to this documentary ... we're told Paul was working on his memoir ... a first draft of which Paul completed prior to his death. So, yes ... we'll get to hear his story from his POV somewhere down the line.