If you want to create a point forward build, definitely create a small forward. You won't run into that height restriction that way, too.
Here's a Point Forward build you might want to try. After you've entered your details and chosen to be a small forward, created a face (or scanned your face; good luck getting that to work!), start out by selecting this pie chart for your Skill Breakdown:

Choose this for your Physical Profile pie chart:

Then you'll set your potential attributes. These are the maximum ratings you'll be able to upgrade to. They'll also be affected by choices you make in a moment, but it's a chance to optimise them. You can obviously play around a bit with these, but I think it'll give you a good balance. Also note that while ratings in the 60s and 70s may seem poor, they're actually more than decent, especially once you've earned a few Badges. The ratings I've suggested here allow for a decent amount of Badges that should be helpful.

Set your height. You mentioned you wanted to create a 6'8" player, so that's what I've done here. Notice that a few attributes will change accordingly. Leaving your height at 6'7" will keep those ratings neutral, but the extra inch is probably worth the trade-off in the long run.

Weight also affects the ratings caps and physical attributes. I'd suggest making it 220 pounds because you'll get a slight boost to acceleration without affecting any of the skill ratings. If you make a heavier player, they'll have a stronger maximum strength rating, but lower Speed, Acceleration, and Vertical.

The final measurement, wingspan, also has trade-offs as longer and shorter arms have an effect on your ratings. By dropping it to 81 inches, you'll gain an increase to your shooting and ballhandling rating caps, at the cost of a couple of points off stealing and blocking. You'll still be able to swat and swipe with ease, and there are defensive Badges that will help out there.

Finally, you'll set your Takeover skill. You can go either way with it, but I'd suggest sticking with Playmaker.

If all goes well, you should end up with a Point Forward!

Now, a few adjustments here and there to the ratings, or a slightly different Physical Profile pie chart, may result in a Pass-First Wing build. As far as I know, that build still essentially functions as a point forward and has a very similar skillset, but the steps I've outlined will get you to a 6'8" Point Forward.
Here are some suggestions of Badge upgrades to aim for, starting with Finishing.

I have two suggestions for Shooting Badges. The first is assuming you don't want the speediness afforded by a Gold Quick Draw Badge. This configuration will work well with Klay Thompson's jumpshot, which I've found rather easy to master and is flexible enough to work online and offline.

Alternatively, Brandon Ingram's release with Gold Quick Draw is worth checking out. Note however that it isn't a unique animation, so you won't be able to assign his exact animation until you've played through MyCAREER enough to unlock the Jumpshot Creator, at which point you can create his release.


Moving on to Playmaking Badges, here are my suggestions.

And finally, Defense/Rebounding Badges.

Once again, there's room to experiment here depending on how you like to play and what you find most helpful, but that should give you a fairly LeBron-like Point Forward build with Badges that'll be advantageous online and offline.