My goodness, Michel. You don't give yourself enough credit. Had I the capability to produce a composition of this quality... I must say I'd probably brag a little bit! Seriously, your humility is amazing. Now then, on to the review.
I am also one of those unfortunate individuals who lack the training and sophistication to really dive into the music without a rather large amount of studying. That said, this review is going to focused on the first movement, and once I have managed to study the rest of what is here (and hopefully the subsequent movements as well, soon?), I shall return with one of my little novellas like I wrote for my IB Music exam.
1 - Forêts Boréales
The first movement was absolutely grand, in every meaning of the word. The opening pulled me right in to what was going, and after this initial "tug" of sorts, I felt suspended by the endless harmonic surges that seemed to make up the entire first thematic section (up to measure 39). The rhythmic motif that you introduced in the opening fanfare had this element of vigor that is rather difficult to put into words; the point is, it really drove this section forward, especially once placed contrapuntally against the other, descending motif of this section. It was all in all a great opening, and had me hooked from the beginning.
Then, measure forty and that tantalizing clarinet solo. Je ne peux dire que "bravo." It was a lovely sort of respite from the constant build up of energy introduced at first, and yet you still managed to hold enough tension in the accompaniment to move this along as well. The first time I listened to this, I was honestly expecting more out of this
meno mosso, but your quick return to Allegro worked perfectly.
The way you reinstated significance upon the original theme of the fanfare certainly served to sort of "reaffirm" the reality of the piece, for lack of a coherent thought process at the moment. And then, out of nowhere, the lovely little trumpet line at measure 60... I chuckled a bit when I first heard it; it seems to come right out of nowhere, but as it continues, it of course fits perfectly with everything else. And I felt as though it were an interesting play on the rhythmic motif introduced in the preceding clarinet solo, but my brain works in funny ways.
Ah, I see that trumpet bit wasn't stand-alone; taking a better look at the score, you actually introduced it in the strings a measure or so beforehand. Silly me; I suppose it would be more noticeable in a live performance, eh?
All in all, the rest of the first movement here was simply masterful. Your note in the introductory post here was a bit of an understatement; this is
highly contrapuntal, from what I've seen and heard so far. The mélange of thematic motifs in the final few measures was one of the grandest endings I've heard in some time - et vous osez de me dire "je ne suis pas fort en écrivant les fins !" Comment ça ?!

It was marvelous, Michel. Absolutely marvelous.
As I've said, I'll return after some analyzing of the rest of this piece and expand my little review here. Yes, little. >.>