If the rules abouit poetry were that natural and eternal, we'd not be rhyming nowadays but still using assonance and alliteration.

Ayway, here's another version from the tradition:

THE FAIR O' BALNAFANNAN

I was come from a fair,
From the fair o' Balnafannan,
When I met a winsome dame,
She was as fair as the Annan,
I asked her where she dwelt
As we strode along together
On the bonny mountain side.
She replied "amang the heather".

I will build you a bower
Down by yon clear fountain,
And I'll cover it a' o'er
Wi' the floo'ers o' the mountain;
I'll range the mountain side
And the dark glen so weary,
And I'll bring home my spoils
To the bower o' my deary.

As sung by Jeannie Robertson as "The Braes o' Balquidder" on Collector 10" LP JFS4001, "Lord Donald".