ANH starts normally until the scene in Ben's hut where Luke asks about his dad. "He was the best starpilot in the galaxy, and a good friend..." Then have the shot of Ben sitting back stoking his beard and start some 80s flashback montage song and dissolve into the opening shot of Phantom Menace while having him do a voiceover setting up what it says in the Ep I crawl. Then just show the prequels edited with cheesy Ben and Luke dialog like Ben's telling a story Princess Bride style. It'd probably be funniest if Ben was sanitizing his story as he went for Luke's benefit, like glossing over the sandpeople incident and awkwardly sidestepping the last hour of ROTS, but the clips shown were still violent and spoilery. ("then your father had a civil sit-down chat with the tuskins and got them to agree to set your grandma free" *beheading clip*... "then your father had to rush up to the council chamber to see if the younglings were safe from Vader" *ignites lightsaber*) Make sure Luke is extra whiny all during the story. Make this thing like an 8 hour edit and have Obi-Wan tell his tale like he's half senile. After the prequels are over just wipe back to the hut and have R2 show his hologram and continue the movie.