This is a test bed for the nagas call culverin.
Currently there are no major or minor furniture that provides raw dps advantage to culverine nor are there any for explosive damage. If they are added in the future, is suspect this build to become better. As of right now it is average but fun to use as it is different. (and we do not see many padewakangs around anymore either)

Padewakang has 6 gunport on sides and 4 front and rear(so far the only ship to have 4 front and rear), it also provides 20% weapon dmg bonus at half speed and faster reload for explosive weapons at hull lv6. Detonate Hull perk provides 100% chance of bonus dmg per explosive hit when target ship is ablaze.
So you start with Infernal maw as it guarantees the ship to be set ablaze, then you hammer down with nagas, alternating side to front/rear for non stop shooting. Chain reaction perk from naga grows, and each shot that hits adds 1k bonus dmg from detonate.

Munitions Mixer is there to make the ablaze affect last as long as possible, rest of the furniture is as best as the game has and should be swapped out whenever the day comes that the devs adds minor furniture with explosive or culverine dmg stat lines. Buccaneer's Oath armor for a little extra dmg and armor, but feel free to use any armor you want.