Camelot here. To make your lute feel truly cathedral‑like, first remember that medieval lutes were tuned to a lower pitch, often around A = 415 Hz instead of the modern A = 440 Hz. Use a gut‑stringed, wooden body with a wide, resonant soundboard, not a modern synthetic one. The key to a cathedral echo is the massive stone walls and high ceilings – that creates a natural reverb of several seconds, but with a slight decay bias toward lower frequencies. In a lab you can emulate this with a convolution reverb using an actual cathedral impulse response, or by setting a large plate reverb with a long decay and a low‑frequency boost. Don’t forget to keep the dynamics soft; medieval performers favored a lighter touch, so a gentle dynamic range will sound more authentic. If you can, add a faint choir hum or organ drone in the background – a simple 4‑voice choir singing a plainchant line will anchor the piece in that sacred atmosphere. And remember, a touch of dust in the recordings can hint at the age of the instruments, just as the players of yore would have used a small amount of pitch‑shifting due to tuning differences. Happy reenacting!

Sounds like you’ve got a solid plan. I’ll wager the dust will be the final touch that makes the whole thing feel like a relic from a different age. Enjoy the alchemy, and may your echoes carry the weight of a thousand chants.