modify a outboard bracket from V bottom to a flat bottom

I would like to modify a outboard bracket from V bottom to a flat bottom, basicely reducing it's height from 19" down to 16" in order to fit a 20" shaft engine.
here's the plan:
1.cut middle section to remove V to flat not sure how much for initial cut to cut out of middle mite be safe to cut maybe 1/2" from one side of V to start w/.image

2.cut the end V off transom end then bend both sides into flate bottom not wanting whole bottom flat just enough to properly mount the pod at correct hieght where top of pod is mounted at 19" maybe 10" of flattening.
3.have it welded up.
I may have to section the engines end transom angle to reduce transom angle the pods transom end is 90 degree.
here's the plan:example pod agaist wall image I will do this procedure on the actuel transom the wall is just my method of finding the angle.

lean up agaisnt then tiltup for desired angle. mearsure from pod to wall this is the amount to remove for desired angle correct?only want to flatten portion of lenght maybe 10".
Please advice an thanks for any tips

 

I cannot be certain that I understand the reason for doing the modification. If you use a 20 shaft outboard on a 16 inch transom, there will be additional drag and likely a lot of spray that will climb up the shaft to the power head. The plate will be too deep below the surface and too much of the leg is immersed. . The usual setup is to have the Cavitation plate, (anti ventilation plate if you prefer), about one to two inches below the water surface. For higher speed boats the height is adjusted upward nearer the water surface when the boat is in planing mode.

Describe your boat so that the reason for your modification is better understood.

 

the transom is 45" don't think about transom height. when using a pod the pod size determines what lenght shaft you can use.

a 16" height pod can fit any lenght shaft by placing the pod at correct height. conversely a 19 or taller height pod can't be lowered enought to accommodate a short shaft. a 19" an taller pod is only for 25" 30" shaft.

so I want to section down a 19" pod to 16" to use a 20" shaft. here's an illustration.

 

Update on the new pod: I picked up the new pod a few days ago it’s in much better condition than I anticipated from pre delivery images.



The pods angle is 13* on both ends my transom is 14* so I think re engineering the angle isn’t necessary.image.

I will not shorten the length either. I could get by w/ 27” setback but it’s not worth the effort to shorten from 31 ½”.

Time to remove the splashwell for a full transom an still able to tilt up 100%.how is marine quiality aluminum classified?
inside of pod is very clean.

one of the scarifical anodoes inside mout somehow got busted off. see the square piece inside pod thats the bolt mount. will fill w/ water to see if she leaks but it looks water tight if she leak I'll cover the inside w/ west G flex.
Refurbing the corrosion pitting on pod: considering JB epoxy to fill in corrosion on a couple midlevel an one lower holes?

initial cleaning w/ grinder wheel.


My next big decision is shortening the height to allow the continued use of the 418LB 20”shaft. Or leave the V bottomed an use a 433LB 25” shaft.(not sure engine manufactors factor in the prop when advertising engine weight?) I’m leaning toward the 25” option for a few reasons.

The pod needs a minium of 3 ½” above the keel I believe this height is to prevent aerating the water in front of prop.(shortening height won’t effect this) image.



20” to 25” shaft conversion options:

Obtain a parts engine for it’s midsection, an transplant my power head replacing a blown power head. I’m planning a 200mile one way road trip to look at a prospective parts engine if it has a functioning EMM cleanish flywheel ect. I'll go parts engine route.



Or Bay manufactorings midsection extension, there complete kit comes w/ midsection extension, bolts drive shaft an shift rod extensions $750. plus ship. Outboard Motor Extension Kits For Sale - Bay Manufacturing https://baymfg.com/



Or Bay manufactorings midsection extension on Ebay $350. which will require bolts. 25” drive shaft an shift rod from a parts engine.



Or swap my Evinrude ETEC power head on a 25”parts engine. I prefer the parts engine route bc I foresee the need for EMM, flywheel,fuel pump an some rebuildable injectors,lower unit,coils spare wire harness ect.thanks for advice

edit:can anyone recognize/ identify this pod? she has a unick hatch which has a name but this could be just for the hatch.bet the name an get the prize. pod has only a serial #.

 

Perfect!