MYOG Tent like the Marmot Catalyst ?

I've been thinking about making some of my own gear for a very long time, and I've been offered a free 1-person tent inner so I'm going to try and make a new fly for it as a first project. The idea is to make a new fly using cheap straight aluminium poles in 2-person size, so it becomes a 1 person tent with a huge vestibule, perfect for winter solo camping ! Currently I have a big heavy 2P/4Season or an ultraight 1P/3Season so I'm aiming to make an oversized 1 Person, 3-4 Season tent.
Marmot Catalyst 2P is the best example I can find of a modern tent with a crossover straight pole so it's the closest thing I can work from. The third pole keeps the vestibule roof out, simple and effective.
Wilderness Equipment Ace has an interesting flattened top which doesn't seem smart but might also be a good way to keep it low to the ground and keep the vestibule high. Looks like they might use hubbed poles.
If I use internal pole sleeves and clips similar to the Macpac Olympus it also becomes integral pitch, which I've always found great for setting up in bad weather. By using clip in pole ends it will be self supporting like the MSR Hubba. Lastly I can add a few extra guy points along the seams, something the Hubba really lacks.
So while I research fabrics and find the clips etc, has anyone got any advice or criticism of my plans ?
Marmot Catalyst 2P is the best example I can find of a modern tent with a crossover straight pole so it's the closest thing I can work from. The third pole keeps the vestibule roof out, simple and effective.
Wilderness Equipment Ace has an interesting flattened top which doesn't seem smart but might also be a good way to keep it low to the ground and keep the vestibule high. Looks like they might use hubbed poles.
If I use internal pole sleeves and clips similar to the Macpac Olympus it also becomes integral pitch, which I've always found great for setting up in bad weather. By using clip in pole ends it will be self supporting like the MSR Hubba. Lastly I can add a few extra guy points along the seams, something the Hubba really lacks.
So while I research fabrics and find the clips etc, has anyone got any advice or criticism of my plans ?