Apply Simpson straps ( and proper hardened nails ) to at least every other row of common purlins, take care to bridge the principal rafters and tie purlin to purlin at the inboard bents and to bend the strap and fasten to the vertical side of your principal at the gable bents.
Your floor system should be subjected to little in the way of tensile forces and whtever you deck with will serve to augment your tenoned members and tie things together.
Strap your connecting girts as described above, and here the tieing of the corner posts to the girts is particularly important,( again, bend the strap around to the adjacent face ) in that the braces put the connections into extreme tension as wind loads rack the system alternatively one way then the other and all this is ultimately resolved at the end of the line.
Tenons in shear are both preferable to and superior to tenons in tension
The insurance the straps will provide combined with the redundancy of your enclosure system will see your frame serve you well for your lifetime and on into that of whoever is fortunate enough to follow you.
